Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3b163c732e6b36…

MALICIOUS

PDF

91.1 KB Created: 2021-06-18 15:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9b3b0726c58469015d9b0c5668db212d SHA-1: 7b9fa6e71ca4ea965920b66faae1dca1fb8287ed SHA-256: aa3b163c732e6b36877d0894da6e5e7920e0b423a135f790ba6abca6b7ce1bc9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to compromised websites that host further malicious PDF files, disguised as torrent downloads. The presence of multiple links to compromised CMS uploads and disposable hosting suggests a tactic to distribute malware through deceptive means.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838a0fd6cd3---xepomagufuwefuluzuw.pdf In PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/509l492fb3i4gq294302ehmob7/nutijidezejutazirapipe.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/xomaxazukaxolotonarap.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a015f578209---jafuvavuzikisaw.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb675884a3---85550084625.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/64d93d2d8a1583410daddd411f3c8932/17574425122.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/fawunexoverugivujusila.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/tosixavafigaxikaxet.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f9005cef---2560654600.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de94247454---lagasilefonunera.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085c27829773---nijubawola.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/1c1f4d17c59c32dcfadff8a75b2e5894/bezasiwefabuzukevonax.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/84472519897.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/47093934047.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/fanegimukirekatobamosada.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8384bd206---najupajedovajoduruxoz.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607032d624e84---jogosiferitemojofi.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/sujeduwifalufil.pdfIn PDF document text
    • http://www.fileserve.com/file/PMkkZCR/Reign.OIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=reign+of+assassins+2010+torrentPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 3468 bytes
SHA-256: 3e1f0c88ca4bac2f625664aa77ae68e7045aa25a93a68d0f881944fa3f8ad671
font_01_sfnt_off000111a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 5024 bytes
SHA-256: 19c94a86d0a9478f7dc0691aba280211131afddf1f3d0500bafe24d81837b6de
font_02_sfnt_off000122cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CB 13532 bytes
SHA-256: 9fa9561a5b0aa786fd9de17e42b0ceb3839c87a4b81e902c816bcab0b7281341
font_03_sfnt_off00014f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F29 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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