Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f8bfee97712239…

MALICIOUS

PDF

118.6 KB Created: 2021-07-03 06:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 751126fba43459a2fe84e7283bdd64ca SHA-1: a53e502d318b954db6831e162c1a9ddc8aaf9500 SHA-256: 74f8bfee97712239b3143fd001a8a2284b39bc7f5401134c69cbf4b16a57fb89
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by numerous embedded links pointing to potentially compromised websites and disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9706

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://doanhnghiepvietnam.org/img_duhoc/files/35571687396.pdf In PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/94q7p5rs9t69ivvi7ioro1d547/penesagebemakede.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/fd9b8dabd2fcec145845b05b168191f2/dotifuli.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/rumuvuzuxemuviz.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210618200136_wo7936.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/3461023389.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeca19aeb0---xuwufiselekiziw.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/31660cc81cbf8f90f2f498e1383c6c90/vulimidilubazowavegefulu.pdfIn PDF document text
    • https://dacsanmyhuongbeti.com/app/webroot/files/images/pages/files/duduxofawezikaxewekovutu.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1a5e7eab6---gujigigowas.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5949c10636---41931687452.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/c99766741e5fa986065e604a89eb2156/42722691967.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8465ee4a8e---silulalenovekolugux.pdfIn PDF document text
    • https://manenshop.com/upload/files/12192502095.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/bf08f8731351a3957b18e69ffe95926a/fonofafuxasadonemo.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/suxamuxufifuse.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/qkb0790q777bse4ph7ne9140l1/tofetanaxudegenuruji.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/15m02q9v7qm9dcj37epnbvqap5/peluloxutox.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bab1b6921b---pedumixazat.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/riranutifafok.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a16c8c503c---gofuxevetanizikudo.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934430174df---97821103072.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/13077139603.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086318056fae---xudogujaradenozeferoretis.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160af577503005---nunusumugapumapusozuka.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/xinijexupari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=jay+z+and+kanyePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15730 9876 bytes
SHA-256: e7d3cc8afeaeba15b8f5b56fcea907a242a73c7a4eb2a6f8fefd25bafa0a7ecf
font_01_sfnt_off00016d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D13 18256 bytes
SHA-256: 7cb546dc224156849390e893048b809815c4e057c1ba86405a54c3f1a7fda91f
font_02_sfnt_off00019d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001b514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B514 16392 bytes
SHA-256: 439f91fc52918ec11de7c10fc66f42d556e3ca0baf24f0cec7590a9fe4e8f18d

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