Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe7a613c60432da…

MALICIOUS

PDF

87.7 KB Created: 2021-06-30 17:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bd40ed884e04063c2350a058f7fcc206 SHA-1: 2ec9166645c12ffc877207e3fec3cb3730d8f0db SHA-256: cfe7a613c60432dafe69e0b942329ebd91662b96eb78900dcf68a9264ddf8ca0
156 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, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links on compromised or disposable domains. These links likely lead to further malicious content or phishing pages, aiming to deceive users into clicking through.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/17fd479cc56c450ae7fc383573960824/9953553982.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d15a834141---20311448778.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/vajubufuduzemogo.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b131e966c59a09a39853a5599e8f94ef/walutawazufidadune.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/62cd110600be32d0b2a0c0fb326ae585/luxusewumegomoranulo.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/metadorasosukavinonurilu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/14573647834.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d15e98502a---74580761762.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/koxugomutewabudakiwiborap.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/50263398388.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/pofixol.pdfIn PDF document text
    • https://samtee.com/admin/images/file/retifexivo.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/biwuvuj.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/menuwe.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/gasirejipiwades.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c02d6a0b4e---wesow.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/xenegak.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087db85e072d---lifisulusejezewaludufu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3e289c34d---lamitorewu.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/38598102697.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/82854248a2df7b8173f6711f45bae22e/60620824348.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/wowawor.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/wijewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=journal+of+experimental+social+psychologyPDF 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_off0000f370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 16864 bytes
SHA-256: 1dc048f86e7d0afc7e80b50ff1ff055232d3a734a1595135673b58a898fd6208
font_01_sfnt_off00011f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001371e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371E 11232 bytes
SHA-256: ab0228166c72a2f5d4d59d3a9adb3c290056f9f424c0683d5abddcedac4d4066