Malicious PDF — malware analysis report

Static analysis result for SHA-256 8962044357d32dff…

MALICIOUS

PDF

93.6 KB Created: 2021-09-04 21:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a287e5271e84f1389d56427acb9bfb63 SHA-1: e8706b36d494479c419d4ce130371c8cfb8f7910 SHA-256: 8962044357d32dff79635bd862e83451a37dca90dbc0dca86c1c26e9daf4434e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or downloads. The presence of a visual download button further supports a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=download+pdf+books+to+iphone+free PDF link annotation
    • http://iamsong.vn/uploads/files/47370742306.pdfIn PDF document text
    • http://livestocktool.com/d/files/55538869216.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/2387013108.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d43b4ec37---zisiledumi.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/5us8rrqo5u1138g115omjncpce/nojomizod.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef31b13a63---dokupinubiweduz.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/pexupuzenasamegajujuvenis.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/48800508859.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/38131590139.pdfIn PDF document text
    • http://dogable.de/userfiles/file/lilidadotijavagipexes.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/wewatininizogebaxuzok.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/46539546098.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b23d3e99b25a2996682393bdd42aa171/mugamebinuniza.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/kpj96jq172bik9i2qvmkc5vv96/35840675100.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/49538178932.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/44202354220.pdfIn PDF document text
    • http://melvin.cz/data/69001742146.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/vupevavidijokenujazezifix.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/6kfr720p4ec5do6mptj1dep075/welavovi.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a8db0db2---63079255385.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/luligedonifarofeximem.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e14b5ba08---28408945364.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ce8a3121a---39057049199.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/19450722719.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4ce9a960d2---53913553176.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084acb0af6db---68257154268.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/94288857955.pdfIn PDF document text
    • 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_off0001053b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053B 19176 bytes
SHA-256: f687a94a276522c91d1e39577ea3300b6b755f7fb995438f86e377f8e3c98327
font_01_sfnt_off0001372c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F43 10912 bytes
SHA-256: cee3597284bc1fc51bf3041edc587d15976696534fd105c2619ea5e39594aaa9

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