Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1d193f3bef2304…

MALICIOUS

PDF

88.0 KB Created: 2021-08-18 16:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6dcd4befb25d9f55f2b9d79e50cbd64a SHA-1: 2afb2dca042e53aa4e8fbf1c7ac9baf5d227070e SHA-256: 9b1d193f3bef2304720b1eefd1debf16381c4973341d0ba862a744a6e92c4b23
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to lead users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of external URIs and link farms on potentially compromised CMS uploads points to a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://garglob.ru/uplcv?utm_term=the+importance+of+leadership+in+early+childhood+settings PDF link annotation
    • http://verypool.cn/images/upload/File/50700113773.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/78755948027.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/991751387.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/tabifetifege.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/waxodil.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608079d8cec4f---88835366779.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27780914900.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2970b29550---31656526761.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/dc1b3ed4e085ba12b368deec73907a65/6261767141.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161097a598aa62---44868986657.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/rdppj9cnt1unb2l64uceqd6j6o/surakerigedojajog.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/oic6her22hch01ncc1d0lv273r/nuxufunupaxalera.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/41926604856.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/wirabetajunojazipumata.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/36470834044.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/4a9adc2aca370893c2eff2a1b494e01b/43774331605.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fa5e89954---62367918305.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///20216231651106967.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/36556151752.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16105b411e0f8f---11259113731.pdfIn PDF document text
    • http://hf1968.com/clients/48820/File/jafisesivelefig.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/94739712372.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/15825578542.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16071db2d9d5eb---gumajewuz.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085518e66a0a---53021703983.pdfIn PDF document text
    • 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_off0000f2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 17288 bytes
SHA-256: f27f108d5c5fa87e0241e6aea822fba83f619621c37a8d4ce95782f8ddc83f00
font_01_sfnt_off00011f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13772 11144 bytes
SHA-256: 14184d3181d1dd9625e09d79ae73c2b2476caf31c81b44bdb803b86bf46a3fb4

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