Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eaf220dca74784b…

MALICIOUS

PDF

82.0 KB Created: 2021-10-05 16:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a45acdeb3aca42f8f01b19814e7f8505 SHA-1: 716fd2fbe6d81a36c34a0f46ff9521d389b0e647 SHA-256: 5eaf220dca74784bcf8fed0a1080ba815b48348ef27517bdfbd87f56c75ae9b3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c99f4b9cf7c7c299e58c6e97bc5e687/labunaxugotasit.pdf In PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134faabb9b21---56828843428.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/paxusowolodaligur.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/81335487030.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/sfkq2anb1m076l9vn09nrujipb/30520090895.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7b84a32a300952f40679a7b76c26697a/20861643090.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20211005160528.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/saguleguzifelizekafemo.pdfIn PDF document text
    • http://eternaseguros.net/files/files/5667367046.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/tubofakamawuz.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/bifalolawepugapikelixuta.pdfIn PDF document text
    • http://abnicum.com/files/file/76620934689.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/bulevad.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/1035443733.pdfIn PDF document text
    • http://flyingfish-stay.godyouoh.com/userfiles/file/jaraful.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/pamagedut.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/wexijujasofadeni.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/sepesosevunosugimibuge.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/64736083432.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/kajunatogulejejutev.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/09cdf175c307096aa5823dff341a2633/lisob.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/nujutilef.pdfIn PDF document text
    • https://petroservice-eg.com/userfiles/file/jojuzu.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/62632879353.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/jimolipimexebasivol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=deep+breath+hurts+lower+backPDF 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_off0000d8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E8 10692 bytes
SHA-256: 92fdc8c4e9c0b14643a359511aaef1943165ddd6ceedf1fecfaa46f8f8ec7a8e
font_01_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 18612 bytes
SHA-256: 229dee0a8713170b34c70cd541f8a468b96eb622c0e1469116050f2c45f8526b
font_02_sfnt_off000121b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1