Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d10cf08bfd6f7ee…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 16:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 17bd565ee71bb4dca9e1fa720f3bc31e SHA-1: a870f2a913f97166c5a1ef77015ab34578c90db0 SHA-256: 3d10cf08bfd6f7eee52a7b9f6a64822fd8b19d4ac0fdcb2e6da638b75bea392b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and link farms strongly suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=the+dichotomy+of+leadership+pdf PDF link annotation
    • http://fields-on-earth.com/images/blog/file/semepobaputojarozivoze.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e038051c1384a8fbc7f9723f3d8d862b/gumixoz.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/mupipafanifuzoxulodowuma.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/zisalawedube.pdfIn PDF document text
    • http://skia22.ru/pic/file/xipalojiwu.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/gokavepeduxibimaz.pdfIn PDF document text
    • http://redactron.com/userfiles/file/vukopaxokit.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/kuwexiwuwepoz.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/womivalujodivuli.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/7994723722.pdfIn PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/betujugerijegow.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/kujexafawofifaweduranisoj.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/865db26ccfb296615e0f4694ecaf6ec7/36684165703.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/petokukofabiwuf.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/gawaremoxemo.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1614357fb8045b---67596589988.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/rekope.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/77146772325.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210911_115036.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3fc02587---75418332643.pdfIn PDF document text
    • http://web300k.com/upload/ck/files/zusugemuguwe.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/pitudilo.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/nofubidikubawi.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/vijipazutifofowek.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_off0000b07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07B 10860 bytes
SHA-256: 13ae901ea692cbde05ce5550967bc944441d82e7d1c943fc84894b4d5e00f212
font_01_sfnt_off0000c991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC991 16168 bytes
SHA-256: 2782c883384a84b7d83919f259958d4cd0117c329e9238b3bfd0f0bbeecabce9
font_02_sfnt_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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