Malicious PDF — malware analysis report

Static analysis result for SHA-256 c988199e98c9fdd3…

MALICIOUS

PDF

77.2 KB Created: 2021-07-03 12:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c8b8dc37423b0ba88f75045f354d459 SHA-1: eeb5e37647570eb19f6e49377fea07e608efe62f SHA-256: c988199e98c9fdd34b7317ae860ccca8154ee07a18e2d21fc728c78d2f31b979
164 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content or phishing pages. The presence of a download button lure reinforces the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/d0e4ca6cba8f074766eef414fbdf151b/potorufenogasosogugagelu.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/0d05a93ace1fc639f99aa0ce0dc15178/dixajebisulazinewuvefom.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf4c863544---95255252991.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/739fa2f449711fcbee12e4a1888ea5eb/somilijagawotemor.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa53d93350---70493999433.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160becd019ba12---54294445425.pdf
    • https://suprizpin.com/calisma2/files/uploads/bimaruvobipe.pdf
    • http://fresh-j.info/images/uploadedimages/file/61326133869.pdf
    • http://splogservice.ru/content/file/tefizosuremeleta.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160911f42173dc---41795148991.pdf
    • http://iuf.kr/pds_down/files/57351111618.pdf
    • https://heritagecambodiatravel.com/userfiles/file/82947926382.pdf
    • http://kimhoatra.vn/upload/fckimagesfile/38531118351.pdf
    • http://cs-web-design.de/ablage/userfiles/files/rufiwit.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b6ce75ca8---ligefaforab.pdf
    • https://livre-art.com/ckfinder/userfiles/files/leluzimemumuzipadu.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/mkdtteneh0gqa0f1u99rf86qu1/54410311472.pdf
    • http://michellesmithscott.com/clients/36670/File/maxikebokumetifakinelowud.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/6a16980b7fcae6133a32e081626da3be/pulutesosi.pdf
    • http://abc-tel.ru/data/File/45034165591.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b704c98ce0---maweberemasubanowapo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=let+us+c+by+yashavant+kanetkar+16th+edition+solutions
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c854.bin
ede0d2237210c6394eefd7097b2f55ef80d61bf6a9374a209510fea00140bb4e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC854 17472 bytes
font_01_sfnt_off0000f4c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 16792 bytes
font_02_sfnt_off00010cda.bin
63fa774130a0192b3866d4aa271b646117fad0cfa7fbc830b57c82bcb60dfc7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDA 11156 bytes