Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e3b723aad79c4d…

MALICIOUS

PDF

64.4 KB Created: 2021-06-18 22:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 44419dd796478db7678351fde55c5d7e SHA-1: b29e4bdfe70f582be59f95c12940bfc3a6f8cfaa SHA-256: f3e3b723aad79c4d80b48cc96c2ce549940d5e52cc760fd27d6417d15fcae004
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a lure for users seeking cracked software like 'Office 365 android apk cracked'. The document body is heavily obfuscated, but the presence of external URIs and link farms suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://philabc.ru/uplcv?utm_term=office+365+android+apk+cracked PDF link annotation
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/96fd5713b6834f5696d4d44ba1079e31/basoxixemutezujotazasuj.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/1ddb7e7dc19c317dc22d71d29ef9ef83/govalafifojudiga.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/f051347a5155a08d63cae03bd202be30/70589509736.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0cce92e46---2693165656.pdfIn PDF document text
    • http://chikatere.com/Upload/files/81561940877.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d502c5952---mejuvubekamamowugigem.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/soraribegaf.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/71507032523.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/66936927087.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/9b6a9bca637e89a460055863f930101f/juzaju.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/687ff40410e286aeb995e14c60bcdd7e/61951162080.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b08a9d158---zezefiw.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/nabagukenofubapi.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/d8f415ada02370174d0d5bb173e0ad07/84464866206.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3734d98ae3---pisixibanurasovedate.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c099d9e0234---nowidekepiwoluwo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB581 5472 bytes
SHA-256: bfb35d8a4636fe19db770a384b8eb11d006e8263f8a030559530c1eece8e485a
font_01_sfnt_off0000c824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC824 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000d0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B2 10292 bytes
SHA-256: f1ff4bd6158f9727625f7ec46b982158f5c10c01068f19df77c34b5939640796

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