Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa1925e8e2aaf7f…

MALICIOUS

PDF

102.7 KB Created: 2021-08-11 17:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e46802bceb15ec3e8592682a3b129d4f SHA-1: 04425628d9022b777f85483af0f8965154dc69f2 SHA-256: 3aa1925e8e2aaf7f0a554b628b774e6d0f7a4f8e63b87b552713ee8ca4782abc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b2865b833---tipijigegolabunam.pdf In PDF document text
    • http://flemingdecal.com/uploads/assets/file/xevaranoj.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/bazunejizurakokuneno.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/12088429974.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/bm3i284sqibmvv8s9hps5m0m3u/podaguji.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd7cf2c9fe---zidawafugelegaxiputone.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/77216200136.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/4345649158.pdfIn PDF document text
    • http://yejida.com/userfiles/file/kovevaxoviseferigojeja.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/12458172624.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/qs7t0s2g2srnnklijub0r9ac4a/giwebewesaxux.pdfIn PDF document text
    • http://riverbendhay.com/clients/4/4e/4e1cbd84181290ddb66fb035c9950ff6/File/wetigupokebunavok.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/f3acedb1b6bf425d35ceeb765788c1a4/dizaraxixezipefupibibuju.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/betuzuxep.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/4c6ae88d629dda0ebd78ecc8139061e2/35920296909.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd9412036d---9923756331.pdfIn PDF document text
    • http://pvvc.cz/files/repilamorobuzolilufopuve.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ff7494db913d89370de8e43f8dc9ea4c/lidavivemajoj.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/15298269013.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cd08b8a4e---78943221781.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/68577228353.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ud78vu7rg60mlqb3bd1o8u0hgp/35292481251.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819f566a5d4---jiwosakawetomokumol.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/77818968714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=freak+the+mighty+worksheets+activitiesPDF 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_off00012c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2A 17392 bytes
SHA-256: 78bff7ff6ef557ee193e5daced828d17f33467b17361ef33d672c37e75709082
font_01_sfnt_off000158ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158CA 10864 bytes
SHA-256: 87a5647a8deb7da35f7c043df95493e841cf63580105f18de98d27da68fe3eb6
font_02_sfnt_off00017203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17203 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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