Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36fbbba67f146da…

MALICIOUS

PDF

92.9 KB Created: 2021-07-19 05:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf323f991561205f501453c3610fdbf6 SHA-1: 1d102cc152572a05155d6ae2bab173933d4d433d SHA-256: f36fbbba67f146da5798e06670f280f4bfd394cc4e1189df85f2c716ef0a8d75
156 Risk Score

Malware Insights

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

The PDF document contains a link farm directing to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous embedded URLs point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/hbsk9apuieecu0l989r7jm5ar1/pebitatifokex.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/7036a3f02a44ed45b1fe0e02067a541e/nedokiwaworanodulesitoja.pdf
    • https://egyiksem.hu/uploads/file/dovemiwoj.pdf
    • http://alfavit.tv/userfiles/file/53923612405.pdf
    • http://musthighschool.mn/ckfinder/userfiles/files/goxazibimerusirimabiruz.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607269f5c43a7---84722775371.pdf
    • https://arrayamed.com/userfiles/file/suvebiponunidotowerujego.pdf
    • http://kingalbertltd.com/uploadedfiles/file/95403038930.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4644e9c7b---82158083373.pdf
    • http://mim2010.ru/userfiles/file/61953508594.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/0face5ebd806d90bc87be030e27f9895/24322661725.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec87d05d59---15642158267.pdf
    • http://tortsurprise.ru/upload/redactor/files/52083457783.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e223aee49---wufifadenor.pdf
    • http://camwater.org/media/files/zolosewurobana.pdf
    • https://micro-churches.net/uploads/file/74045370883.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/8qdqbtkpr8vo24r3h006o8208l/romokoxapivuxowob.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/548ff9417ebfbfd0828f3655372d7a7b/21843141263.pdf
    • http://familiehollander.nl/images/uploadedimages/file/zinogotatojaj.pdf
    • http://nashcentralfalcon.com/clients/d/d5/d5bea9c86035def548a020f7371d19fe/File/16585837238.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/binewowanujaxixemunojit.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/d37e3f43cf0df9486d5bf6ac3cd43a5b/tejusibixazotowudasogut.pdf
    • https://balaji-technology.com/userfiles/file/4378240546.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=defending+a+personal+grievance
    • 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_off0001040a.bin
ebd83b5b44250e52063680719ca47b9dac41b3ed776a9670983eaa2556a3b08f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 10764 bytes
font_01_sfnt_off00011cb0.bin
ffca92c3aabba58c06d50cf2ba61d4d8c24ed68b68975481ff58d5300b326068
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB0 18540 bytes
font_02_sfnt_off00014ccb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCB 16792 bytes