Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5cab0c8f598ad75…

MALICIOUS

PDF

86.1 KB Created: 2021-06-30 23:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6f017607e00c5a6d31f11dcfbba2f93 SHA-1: 7c53452951721d8b4c66624fb0d53a93a9f4359b SHA-256: a5cab0c8f598ad757d28ad089e8311aadffb9743938a657bc85ea71f2f9c97c7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or serve as a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=velocity+from+position+time+graph
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/1fde76d0c354a66b77626a870478e5d3/buretuferak.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d137d05ba---jidijavokakene.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087af825f61d---wifakikuwa.pdf
    • http://bioident.pl/photos_fck/file/vesitokawojenofukolefemar.pdf
    • https://nanyangtextile.com/userfiles/file/50069307370.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec4ce2d07307c186466fdbb51f83a67a/ribaremonixu.pdf
    • http://bularz-auto.pl/images/userfiles/file/65742196787.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/eb496b8277291edf0551949260a81b53/23489604461.pdf
    • http://librojuridico.com/aym_images/files/99095449370.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/c79aac69fc91eb43ade7b0781e93a4d6/dofegexuzevorevawaradot.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5b2de9458---26388093281.pdf
    • http://mcleod-bobbitt.com/clients/64742/File/34527127904.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609826d721ca7---11492889926.pdf
    • https://ehotelgateway.com/bot/ckfinder/uf/files/wupilatazuru.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c37a6f3167c8eddd93df4a3eb8842674/77163891263.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a984d10a215---38592757593.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0899b3420bb0fa52288650be5a588284/36216298137.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/vds91ef263rtmregcl4b1h3rs3/kakarinaseremezotuv.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/nn6vsankfuopbg3nl9p942q400/24165888056.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a217f7a5e85---nigebasatogupofoxifevi.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c84bc829801---kozunizit.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/fac6kdi7gtjjcgre4e73okdb2o/86587002290.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89c723321e---34187637513.pdf
    • http://shopexpert.com/app/webroot/files/userfiles/files/titasadibabududigar.pdf
    • https://topclassgreenery.nl/images/file/40805354516.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8e.bin
d025e42ee3f21f8fdcb820878bffce728f683946fd32e224071e9443d111e954		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8E 17204 bytes
font_01_sfnt_off000117e7.bin
a379d489663db8cf31d7b6cf9528ed25895ada7135e7736fa8d92d33da72037d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117E7 11008 bytes
font_02_sfnt_off0001315f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1315F 16792 bytes

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