Malicious PDF — malware analysis report

Static analysis result for SHA-256 673b6751579a2378…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 20:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a660fa2be9eb4267a47ff9c428fbe4f5 SHA-1: 3b75780dabff0b27fada513950ec6188ef1ce1af SHA-256: 673b6751579a2378126c58bf0176df2c6fd7868186487a85dd6581afe929b6c4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://symbioticlifetech.org/attfile/fckimg/file///202109082542_1008572379.pdf In PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210914182407.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/e3d7c6413caf2e604bb57656450ef1ca/ritesepuf.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/06b4bbc2089944a3a01c7cd3ceb39ac8/8855318224.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161392ebf3fd11---sarulimopewofa.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/wavomitimeged.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/zumejumevapuxawanuvixiz.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/vovibeliwutumujeware.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/59939168628.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381aaaa40c0---50327973723.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/sotafikejapafepidolo.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/40257706234.pdfIn PDF document text
    • https://best-label.com/upload/files/nugalolumifadikasipigesu.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/64357967021.pdfIn PDF document text
    • https://servauto.fr/img/user/file/nemidutekatofom.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/49826157000.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/61472714566.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/kuvapejilar.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/41806559032.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/nobajaliroxujepegosukub.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/26013485302.pdfIn PDF document text
    • http://modero.vn/upload/files/tudibazosewek.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136765530471---kixuduvugupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mobogenie+download+free+android+apps+and+gamesPDF 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_off0000d6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B9 10964 bytes
SHA-256: e1418b41cc0e083fd6525ebf329b2659b70930781e2021b4df7ec27d57991d25
font_01_sfnt_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 16476 bytes
SHA-256: 473dcd2d15e9e75c6a3bd1cfbecf3c97754932eda9ca592c74f1b6a4d6a52fcb
font_02_sfnt_off00011a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1