Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce18769f856841c…

MALICIOUS

PDF

94.9 KB Created: 2021-08-15 22:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 680eb530ba9c39cc94db8672f331e78f SHA-1: af1ca5e7ffc441aa3fdf9ad80915924d1703cb76 SHA-256: bce18769f856841c4daf9ee21902096fdf7abe7f7360f7b0278a76c80f5634b6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the presence of a link farm and compromised CMS uploads points to a malicious link distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://pistant.ru/uplcv?utm_term=david+wilkerson+the+vision+and+beyond+pdf PDF link annotation
    • http://teplolux72.ru/upload/file/44750024980.pdfIn PDF document text
    • http://zerosquareonline.com/file/11004005839.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/45d69af78061b750291f1d694bfb1b29/28072438679.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16117e04530096---rurukubedesunofit.pdfIn PDF document text
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/53239943037.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ugodr0pgk83j0ljo8r809r2hdr/josurusado.pdfIn PDF document text
    • https://invest.pl/userfiles/file/95188895796.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/xipunarunomawenatava.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/83128412768.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/94fa7df3f34330c78daea08ec12f9a79/9431254981.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/pitivi.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/vogoroxuwovisadaxano.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/wajaworovuda.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/64427410305c8a40ea7927e79930c2d0/nunuxevi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c651ff2aa71---3870992617.pdfIn PDF document text
    • https://ever-progress.com/upload/files/nitepizigisu.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/bonamopiza.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/dinumakadedexigunafaku.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/1qal5a7qs6k3vb4d2me8debcfb/24538361069.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/7c4b3e55c5fddd0ea1eb8a1c0c9e424c/kesurolomunuleka.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/22972281534.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/26/file/77763053410.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/48194784187.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/4af48e4ed253afb4d3e4fb5b4d36aa64/70404575804.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0e11abb17---29562096414.pdfIn PDF document text
    • https://pasarantogelsatu.com/contents//files/pibekovaw.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_off00010c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C80 11092 bytes
SHA-256: 1ce679c8a78fd313f0ef7432afb1603cb99cf5f6b0c495aaf4c264cee9e4a2aa
font_01_sfnt_off00012615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12615 17324 bytes
SHA-256: b1a36b0f7721cf230d6886fd894fc1d19fd8dfca33b9b60f3623b36f3c89e46e
font_02_sfnt_off0001538f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1538F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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