Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c2cf54f5564db1…

MALICIOUS

PDF

82.2 KB Created: 2021-09-21 20:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c678753515e41b4dbbd43559ff0856e7 SHA-1: 33e78d20cd5453d368f827f70a3d76be9cca43d5 SHA-256: 75c2cf54f5564db185ad63b5a1dfefe7b59325401665b872951c799bdbb564aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely to lure users into clicking malicious links. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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 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://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/fa368d71705639b9ff077234d731756b/pimopik.pdf In PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/906dc4f35a4191efece1b12f92f7c679/judugamotasudovanev.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/tepegodoloraso.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/91504675549.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/27277188814.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/38296335795.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/nerexefelanovegugowezi.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/jujulufujef.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/mamigiliva.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/67307551236.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/6o4th298rntrf0b076mqi0vjfp/gizazufazeg.pdfIn PDF document text
    • http://punaide.com/userfiles/files/sinefesulefotuj.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9e8c36264---43179065205.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/pezukafi.pdfIn PDF document text
    • https://htchninc.com/d/files/95824982911.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161453f8f987ed---xekiberito.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/76459271047.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_12_07_21_01_2250.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/41683571229.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/56947472058.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/6548382174.pdfIn PDF document text
    • http://pneusmarene.it/images/file/40487184914.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/33842335418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+free+v+bucks+with+no+verificationPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FA 19380 bytes
SHA-256: 334fb3879ccfbe51cef2c4f23c5513e71b858fc85e74acb2e9f9d360099ffa3f
font_01_sfnt_off0001096b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 11044 bytes
SHA-256: 7087e91e5f67b770cdec516f80c0deb2d343019be9037614e1c970a0d3c1d4f1
font_02_sfnt_off0001232b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1