Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f96bfafc1d583d4…

MALICIOUS

PDF

95.2 KB Created: 2021-09-02 04:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7601e417bf32256a92b824cffad94409 SHA-1: 5aa2d10e543d50bbe3b38af65a19bd7956b597e3 SHA-256: 6f96bfafc1d583d41ea49956f10dd6e78cba6e0a0f89c42300818fccd06af704
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external links, some pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to direct users to malicious sites. The document body is unreadable, but the presence of external links and the overall structure strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://desertofohio.net/clients/4/43/43f38f6e2239b09326489e1ba67fa1b6/File/duwonupidizusiwabitira.pdf In PDF document text
    • http://worshipedia.net/sites/default/files/file/70952369455.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/15sbr1hv6pkp6ns1orqkrlmjd0/komitalizada.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/setaxafori.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/74657653738.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/gavokugek.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210510055002.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/raxodopaxibijotoros.pdfIn PDF document text
    • http://chinalabware.net/d/files/8359908426.pdfIn PDF document text
    • https://lncl.org/ckfinder/userfiles/files/waviwu.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/0dbce8a9e75cb04c975772e4da3c5a99/fawasuwiredipuguwanunini.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/63670500684.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/33993901877.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/serinovubizatipaxok.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/sotoz.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/5523917982.pdfIn PDF document text
    • https://actsonics.com/uploads//files/202108021945056222.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/b7qcbplf9q07ciii4slu289au6/31099290964.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f17ba1cf9f---sorisitimizovenotapolegak.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/kigesomapagobiniwe.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4fecdf055---jidekos.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/tugonaz.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070473b4f91e---27274332476.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/f4cd1bd86e222c12da6b780e90f54761/datusuditirigezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=cost+of+building+an+abattoirPDF 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_off00010fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC7 18156 bytes
SHA-256: e6857d13f7fbf4b9e8669102b9bbfcf8916597bc1a2b34bd31309849b332029b
font_01_sfnt_off00013ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000156f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156F0 10668 bytes
SHA-256: 42f36ee36e58648d0c1f6a0fb5465e0f041e2222af22fb175512b852f76c3267

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