Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3ac4ac28157d47…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 05:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7120fe24a2b7da28c91e73c325718f7 SHA-1: 602c85da0651783f67e4aa6d3984bec2ff5d46f7 SHA-256: 8a3ac4ac28157d47d3fb6a2d3b429f34b8fb0952f4fe6e483631019e6a95a410
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by ML classifiers and ClamAV as malicious, indicating a phishing and trojan distribution attempt. It contains numerous links to compromised WordPress sites and disposable hosting, likely serving as a link farm to distribute further malicious content. The presence of a 'download button' lure suggests a social engineering tactic to trick users into initiating a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=apk+mod+of+subway+surfers PDF link annotation
    • https://brothers-music.com/ckfinder/userfiles/files/nawetawirunumun.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/vf3a6sojq8hqvbnti4tq83va5p/35009798017.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/92587655241.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/wajutiroditujurarib.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146e0592d559---fijenaf.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95651352807.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/55055222555.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/jefapiwibogananof.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/rosuzugalox.pdfIn PDF document text
    • http://gibisch.org/files/files/wemidemojar.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/xasami.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/kidefigexibulufi.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/84884227176.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/42888409084.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/buzefamutidigilolu.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/70353981382.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed4dd8b2f3---90437483071.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/pusifugurewe.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/79746079773.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/75852996949.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109020553592596.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/89713fb12607891c9b5a8773434ba98e.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_off0000d8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B8 17308 bytes
SHA-256: ccf86971a30feb2ea384f9e33d5eacd2dacef8a679b93168fb83069196983c86
font_01_sfnt_off0001055f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055F 10832 bytes
SHA-256: af03d8a8f5af9c439c33e02788a826addb087cfe38b4d04bea472a03edd9fd44
font_02_sfnt_off00011e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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