Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f5c6e5b0754f7a…

MALICIOUS

PDF

92.1 KB Created: 2021-08-25 23:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4c25787b88d92d9b39183719823775de SHA-1: 26f17a299df9e2bf45501b5ed7647b130a07ce2f SHA-256: 16f5c6e5b0754f7afeee61fabb9bf1609114bcd46a7d976419e677a423922955
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are hosted on disposable domains, characteristic of a link farm used to distribute malicious content or phish for information. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obfuscate the final destination and track user interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://tadimtursu.com/image/files/nozozatomozofisivu.pdf In PDF document text
    • https://mariellatriolo.it/public/file/wawutarow.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089707067876---regemoxujajoxule.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071df628fc42---38383796974.pdfIn PDF document text
    • https://cristalensi.com/public/File/xigisitatimokabo.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/79338821495.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/tefafekezotosonosufu.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/tebafajipigadididubi.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c2589dcba63f38aa61b831c59155ec34/10874990380.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/38598786326.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/31802895100.pdfIn PDF document text
    • http://cocoal.com/uploads/file/39987835426.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/26986030768.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16099df119c60b---dages.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///32484079671.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/3724795273.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/dd48b5f1a3dedacf54d1d50e08380b53/mijetoxoxizizefegezenare.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/9d8f19c0e1b242693977797980c50fdc/kisinebuwepupewovexukixo.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa4b548561---zipoliw.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/43714881914.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/f2uo3r5jatngtu97929nk27417/91939302665.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/99406291284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=yellow+skinned+personPDF 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_off0001050f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D21 17532 bytes
SHA-256: 3de01a3513b6682448758a7bbb96ee0f400b6f2d713a1964018ad18271d62ceb
font_02_sfnt_off00014aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAD 10288 bytes
SHA-256: 9e0211095dbbc62b0e4572a89ad313ab999fdda0ddc7d60d79cd951bb09f21d8

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