Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad8c7aa4275c91e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 13:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e479ff9098aaa326ebfb728e948afecb SHA-1: 0324790a7fa72dbe1fd24631d3ae6144b7201294 SHA-256: 4ad8c7aa4275c91ec969c38be8e4e68655167001df9813428572afa51904bc1f
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of these links indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sardavetri.it/userfiles/file/limorozogudopokomisala.pdf In PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070540a210bd---wikawejex.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/bolodof.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/5549917904.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/706h43ihjc929lo8l70mi8or5u/povivu.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160949608520f2---67133108437.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd5801b702---57584679671.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c55f2a90d65---wepawurab.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1611f9cf197a6e---11174551379.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/56252ecee6dc8b5bc3bea3394bf09a49/80314517611.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/94345701905.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/74501711356.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/zebekidigexenugeke.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/74818948925.pdfIn PDF document text
    • https://miet.hu/kepek/26132480843.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a9a23a694---xivuko.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/ruxoxowazomovegobironod.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608920f9283f0---42600060084.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69b375f60b---lomudipegebapojelusudag.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/ravitologixalojim.pdfIn PDF document text
    • http://jainfarms.com/uploads/tekopokuxiko.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1610b6cb0dc6f3---98788690604.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/bevijufikibi.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/sosibexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sage+x3+gestion+de+stock+pdfPDF 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_off0000d7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F2 18980 bytes
SHA-256: e26b7568bd1606b883a8a7f18a786a2457c5d57599c186051ff6043606d7eba1
font_01_sfnt_off00010919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10919 11092 bytes
SHA-256: cc4ef261eff68c3ff5a77f4e87ac623dedbb3fde6124446587c507dcfb676b24
font_02_sfnt_off000122f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1