Malicious PDF — malware analysis report

Static analysis result for SHA-256 710842594fd0d4f5…

MALICIOUS

PDF

93.3 KB Created: 2021-08-05 08:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 287a22c4c1587f4af073e3b03139c71d SHA-1: b61573dc92ffee4b172e676e197eb2c4dd3d6627 SHA-256: 710842594fd0d4f5a6d3cd688fea889c67fbda04a87ab7beea4f381dde542e46
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as redirects to malicious or phishing sites, aiming to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd81a1402ac---raxexezaraxivobamivigeke.pdf In PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/19371670709.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e835263db---3299600255.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/80401702434.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fcb568514---91376316369.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/620e38545455d0f34ac014d04071232e/18252738909.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16092a8600007f---74946639430.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ee053e787---62865904001.pdfIn PDF document text
    • http://ailizia.com/userfiles/68679245282.pdfIn PDF document text
    • http://ahchala.com/img/file/salabetosot.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/oan3c188khmjn7g5i7tlenv2m1/79983382762.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2c81c0200---mogasinan.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/zisinosexifepudu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f86163f6e4---rokuzuxewuxadi.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/9ade5847f0a853d71a5de88bce8eaeae/rigirukuv.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/225900658.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/58315818979.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a8d5c2b0f---56234236593.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/penotadekiwa.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/his270s9pretjgstl2vl497eiv/1694153105.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/xukiwizuwe.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/9514f10241980c10bb8fe987a6209088/16101445736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=exercices+sur+les+noms+propres+et+les+noms+communs+ce2PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 10676 bytes
SHA-256: 07944a2523ebb961a166ac54936c08873c6d7a3ac9f43b0b353156e3a3ee0922
font_01_sfnt_off0001041f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041F 19324 bytes
SHA-256: 0d1bf5364d32a06c2bf37dfca8eaedd87f07173ebd307bbfe4d2ad2282a22b82
font_02_sfnt_off000134db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DB 16684 bytes
SHA-256: 0b66887e43cc35630d0970669c797ecfbf492bb097841a83f6681a0f5b87338d
font_03_sfnt_off00014bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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