Malicious PDF — malware analysis report

Static analysis result for SHA-256 4284694d76183704…

MALICIOUS

PDF

100.1 KB Created: 2021-09-14 08:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f0d45ee15827b2079d1f6d6eb3882dd SHA-1: 501c6ce0b8ded4a04b19b80dc84a4ef78ccca5fa SHA-256: 4284694d76183704210cc6c81e60a2e443dcb3be3ee01ae35bcef2ac7ecd83e2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with ClamAV identifying it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion that it's intended to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://inwebjor.ru/uplcv?utm_term=once+upon+a+time+in+china+3+full+movie PDF link annotation
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/59570989880.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/93801974574.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/71090137261.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/bojuz.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4c7c92358---zujeviwenozoxopazeviv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d66ff3e5a---xosexininowukalekilawis.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/94893621585.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/nufuko.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/86888666861.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fupaxipomutixegajab.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/3282682842.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/2889507756.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/97477178288.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109140303228603.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/dekedexidanudajisus.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613363a214b1d---tukisaxorovele.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/kowususuroburi.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/63390693183.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/99954410794.pdfIn PDF document text
    • http://badgerhillfarm.uk/gojotaxomabakatoduniw.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/12321638330.pdfIn PDF document text
    • http://fpole.ru/sadm_files/pemososizesufipo.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/nikelira.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/jutejuxakupo.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/17898691547.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/pavoxuguvab.pdfIn PDF document text
    • 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_off00011fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEA 10840 bytes
SHA-256: 9bb2ccdd285ebe7fcb610750879b9ef9fd9a7f3d770d3562d30f735c3cf4cd1c
font_01_sfnt_off000138d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D1 18936 bytes
SHA-256: 455986cd3d29596e71ab12eab1c765d75ebdc7796c624ea1fe534ac749b4dd64
font_02_sfnt_off00016a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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