Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcb324b54beaa0b…

MALICIOUS

PDF

91.4 KB Created: 2021-06-30 00:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d86c7963b08d06a1dd8a6ef6f1da6ae SHA-1: 099a3c22b53d881aa18bb4648c936d449f7b4cb2 SHA-256: bfcb324b54beaa0b28bd5ec314c8dfc7024a917af766d18e4e09e1505f6120bc
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to potentially compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the hypothesis of a coordinated redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gjf1524m3egds09gcpi7jjsa81/fabilagaxowofid.pdf
    • http://3xlove.com/uploadfile/file/22698298225.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/40472339937.pdf
    • http://www.pzkexie.com/up_files/file/76979711079.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02ea77324---vipisizoriruzikafabo.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b27367acb1b---20091915240.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0473c5712---11076479551.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d538e914bf3---zuligux.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/2mtt8bssh54ih8k0115rr2p7nq/69959765090.pdf
    • https://propiedades.net/ckfinder/userfiles/files/tomomoxevowaburirux.pdf
    • http://classicalgardenstatues.com/uplds/file/29431566122.pdf
    • https://fallsplat.se/file/38361912982.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f5b55002c---22873089484.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819c6727c28---zojezewo.pdf
    • http://sl-light.ru/design/img/upload/file/67986886500.pdf
    • http://cesurmakina.com/userfiles/file/jetoloxed.pdf
    • http://rjbmachinery.com/d/files/ligagutugifojuwogeru.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4b6cc97e1---16614948814.pdf
    • http://benhvientantao.com/img_duhoc/files/51200692371.pdf
    • http://1utilaje.ro/mm/file/98917971677.pdf
    • http://bukharasuwanee.com/sites/default/files/file/jumobitojifefetaj.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160735369533f7---11422193289.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/ccfe5e69e067ed8d8042061abe92e11f/zekasoralur.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/67rbupubl2474jm8k3kekf2ing/dumagomo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=best+roguelikes+on+switch
    • 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_off0001024d.bin
9f0c5b06675cf944834612814f4d2a4e79cdf33194558767663eaad3e6037a01
pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 10676 bytes
font_01_sfnt_off00011ad2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD2 16792 bytes
font_02_sfnt_off000132e4.bin
c402f35be20f551203118d902df2bcfeef6570c83508ad91f6156eef2eca01ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x132E4 16812 bytes