Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba1c1d2c6c8afa8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 03:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 183359d14243200e192d1807cdb213ec SHA-1: abb09c604375891cd510381e47e1bde45c424c70 SHA-256: 6ba1c1d2c6c8afa8e4ec0d1fa1df10b4bfbbb71a96923b3b4c90ed7b4d4095c7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. These sites likely host further malicious content or phishing pages, making the PDF a component of a larger attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/meehpf31du6vrpfit3hsggp749/gelogure.pdf In PDF document text
    • http://wiskind.com/filespath/files/20210903150901.pdfIn PDF document text
    • http://guchen.ru/d/files/8680872041.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/97350458050.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/wezuwebixuzagusejuzinix.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/64079615451.pdfIn PDF document text
    • http://potya.com/46302026513.pdfIn PDF document text
    • https://davnosti.ru/upload/dujotopetaxozuserom.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/22016994082.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-06/cd81cb977c12bbea3fccb054efe6bea1.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/fevuxapelebixemuj.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be4899d896---14702741177.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-2/20210902095556694153.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/widemizugemabijezozo.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/vizosinakowifoza.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/fisuwaginetudolenumabuzir.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/zuditasufuwijotigazasofoz.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/98688364988.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132d3d1928e3---xanixuwunezadikonake.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/75101799006.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16130fa798c300---nivukul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=harry+potter+and+the+prisoner+of+azkaban+online+freePDF 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_off0000d7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 18488 bytes
SHA-256: 33648abf7608574e939e5fdcb4afe6aee9d756b65d6e5021913021d79ced2a30
font_02_sfnt_off00011fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA2 10992 bytes
SHA-256: 0069762fda1138a221e14fe0ff6b9f51af2e050403e5bb58cdf77ca38d1a99b5