Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81be5d2d12966c2…

MALICIOUS

PDF

93.0 KB Created: 2021-09-15 11:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7025911b7b206163a2075d9fd298c06 SHA-1: 23b20f97d01648f5782c24950de469f791576b6e SHA-256: f81be5d2d12966c241f7f5626bf63a4afaa6fc8188496d106cda0ec68be05a29
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external PDF files hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's part of a larger malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136146948d8c---xobiwakuratedirono.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/u0ako8dv1657ljsoiq6mgdiu16/tupegeguwenurevewapi.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/90402211221.pdfIn PDF document text
    • http://lecostationery.com/files/file/vosamikorojowinepobosesa.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413ac578a9a---10409637797.pdfIn PDF document text
    • http://demkapi.com/resimler/files/baxoganisibol.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/1965842233613cb047175f1.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/98923569125.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/bisebajovefune.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/39824110803.pdfIn PDF document text
    • http://yuli-china.ru/d/files/73645108267.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613cf44f9d628.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/vawuzu.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/49860856083c1ac7f8b68c0e37021671/77013544360.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/14636760378.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/f42c54719d1de1a12e69ac50ff67ed99/98226062812.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/00ccd5bdb87ab93596befc17747d2a26/46239858336.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/52765035158.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/83388683171.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/52572045548.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/ketamapituxiladefimujajus.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/bavotuxojekutodoxanirijod.pdfIn PDF document text
    • https://beaszemin.com/files/bameselojadokup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+train+your+dragon+full+movie+in+englishPDF 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_off00010489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA0 11156 bytes
SHA-256: 94924d5b6a20f170f455eef11bb4f3782d81caa97f6271611fe69b2b1f4264de
font_02_sfnt_off00013656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13656 18356 bytes
SHA-256: 94bd1b1454e6ad892b5fe97b4ce9c0e689280d6d036313cd0b48258940feb003

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