Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e65279cc3132926…

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 03:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4832e681712d1eef4e5eb51b11c58486 SHA-1: 1a8d97e6a5c2c07c7728ff23b0642c04a58b68cd SHA-256: 8e65279cc313292679046950017d3ac32e6385ae2495c7e92a5b71c2b4126ee4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The heuristics reveal a link farm structure, with many URLs pointing to compromised CMS uploads, suggesting an attempt to lure users to external sites. No scripts were extracted, but the presence of numerous unknown URLs indicates a high likelihood of redirection to malicious content.

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://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ba01e9054---43998186049.pdf In PDF document text
    • http://abwmercury.com/uploads/files/rawofuwiwomojeb.pdfIn PDF document text
    • http://cnfglgreat.netsociality.com/upload/files/negelijusemodegetivolafid.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/2d8bdf298ed3620ccc105056b3fb74a2/1058613995.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/83247143455.pdfIn PDF document text
    • http://sfinance.mn/userfiles/files/49955022902.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/xifurabotodugoduxosina.pdfIn PDF document text
    • http://oilspecchem.com/files/94601059423.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/28392937459.pdfIn PDF document text
    • https://dutchhaves.com/uploads/files/202109261835463095.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/nufajivawulivebekal.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/84159210617.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614e9997bf0ba---famikewisurapujefe.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/punedebopibipibilew.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/bomavuve.pdfIn PDF document text
    • http://qdjshg.com/files/file/mapoxaxesujap.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/sesinawipisu.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/eooskmga5m5r9m0grejbofhoq4/fasofujidiwob.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210922205802708123.pdfIn PDF document text
    • https://sinarwaja.com/account/files/70427625865.pdfIn PDF document text
    • http://cpils.com/userfiles/file/xujorese.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/86730622018.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3d93d82b6---54219055503.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/11519588811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+pattern+lock+app+for+androidPDF 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_off0000b297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB297 10756 bytes
SHA-256: a1a29a2e953f0e70217883dc9b1c5457033fcd5e6a125113f486e6e9c9e35f4c
font_01_sfnt_off0000cb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38F 16856 bytes
SHA-256: 1e945936b8fbc8c5b9715ad8c0f4bc3aa9381b72c2f101698f672c9743b33e85

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