Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f82d714103f06d0…

MALICIOUS

PDF

78.8 KB Created: 2021-08-27 21:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d880a85f09561f125c42d280a73f47bc SHA-1: bc2ddfedb0e1f09ee321a18f96350b033dba6961 SHA-256: 8f82d714103f06d04a9f5a13e2deb83a0cae5ef69d317a6be47d4b894847d7c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coaching-scolaire.net/userfiles/file/14807437601.pdf In PDF document text
    • https://medosojewellery.com/userfiles/files/17126636498.pdfIn PDF document text
    • https://asiajitu.com/contents//files/76418304218.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/nuzilevojogogubexukasox.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/cc148fa39c872978ca667cffa673af9b/96907858133.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/9s6a1pq5q07nafarul0a1srg8n/92812962724.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608feba9ee14f---14698877440.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/2632955578.pdfIn PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/32796737383.pdfIn PDF document text
    • https://argumentua.com/i/file/69308368926.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/56183346919.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/26395472718.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96cc05ac2a---20132869447.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/17782871133.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/viwikafuj.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/pizudawegamewot.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/aafnk82s8ajaupcpl2hdc6kcf6/vifed.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/nifubamiru.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/af5e5696dc20b59457815f790885b076/25906652108.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/49150a3f3e94b68e3976deff2f0e3bd9/70354826976.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fc7650726---podagidototuwimopasonit.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/95899760283.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/efc612153051315465761a561a971389/kepijilodemunad.pdfIn PDF document text
    • https://grandegroup.net/files/12180695987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=power+plant+engineering+pdf+bookPDF 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_off0000cf28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73F 10824 bytes
SHA-256: 6d1dd19058ee5ebe50e51c063f852a61e17d93b287c8a0256232c6aa05619d83
font_02_sfnt_off0000ffef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEF 17336 bytes
SHA-256: dbdd1d7781413d3eaca4c64eddd6e4baf3a82756799829d46d685b0c43c3b3d0