Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b7f97cfc3d5a16…

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 15:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ec564c7d628509ebaa439ce2a40bd921 SHA-1: 8124a94708d13af1f326481706e32bee8af73934 SHA-256: 99b7f97cfc3d5a16500128154021fcb93867ab36f5487736962d11803d2e5884
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=weider+ultimate+body+works+workout+guide+pdf PDF link annotation
    • http://twilaw.com/files/files/kuxitobupedonejakapuweje.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/wedisugig.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/ab0ff436a3c81d66e62b0ffd7d18ee55/6626900130.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/465005f1649dbb8f4b85cd423dc02b37/muvanuteno.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///dikukerumezibo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/afma5ao17n0tquhnqj1jaa2hk0/tebena.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/91500612023.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078b4b29a0ce---nukobileduvemoreb.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/silivexisopomiw.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/xesanegonukowuwetuzikuki.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855eb0edf9d---pagipelelaf.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/82832793383.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a115d671380---bodumogevinerin.pdfIn PDF document text
    • http://korytnica.net/data/files/87615469391.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/48243238136.pdfIn PDF document text
    • https://amblamy.ee/upload/file/sufaxizobozipodekolam.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/6d5a7b42489d6c70d244c53fa821dc27/99899764940.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094caec40cf3---gidibidemuzonitowobafo.pdfIn PDF document text
    • http://bgindus.com/t/tutorfirm/uploads/ck/files/30980265343.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb17dd7ad0e---tawag.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f242207db44f2c799e69782615c9d958/temewosobafobabolefovowub.pdfIn PDF document text
    • http://hevolta.com/upload/file/67020393983.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/78322615205.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_off0000bcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C4 15760 bytes
SHA-256: afc43c958d99ff031ea82e2728e5f1f4aa4036840314213273ce6c134a54db52
font_02_sfnt_off0000fcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF9 11260 bytes
SHA-256: 9926faeeec51b8a699603f2fb65e4f764c6409aee6a929afec706a48c36650df

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