Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54fb2bd13aed750…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 22:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8f075ea3f85f10911de5274f4be137b SHA-1: 8f4b2ced7f45dfafe8db02d2288250f0fb9a728e SHA-256: a54fb2bd13aed750611f4bc125951021e0f5c3ccccb1a9e6c6b4e503f0dd7510
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits multiple indicators of malicious intent, including a high ML classifier score and ClamAV detection as a phishing trojan. The heuristics indicate it functions as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting a distribution mechanism for malicious content. The presence of a 'Password-protected archive handoff' lure strongly implies the document is designed to trick users into decrypting and opening a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/a083ksfnmfg8520f28cvf5a7v2/litatokugupumuxijofakar.pdf
    • https://ph2020.org/ckfinder/userfiles/files/jokukikap.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16135d8f524f71---92223333299.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/rivezubozogifagon.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/3tipgpi4el89nr0ce8jqbr42l0/vekorilino.pdf
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/pozamudemugujozigule.pdf
    • http://sanalights.com/admin/admin/uploadfiles/file/29207158720.pdf
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/24297873305.pdf
    • http://stepasidemedical.ie/images/uploads/file/vorozulirujixa.pdf
    • http://kstarsmall.net/userfiles/file///pikomox.pdf
    • http://awarelaxcentrum.cz/user_files/file/64805568775.pdf
    • https://jakspravnenapsa.cz/userfiles/file/rebirilomofikow.pdf
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72684569170.pdf
    • https://vico-real-estate.com/ckfinder/userfiles/files/feponulizuvewi.pdf
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/latoz.pdf
    • http://jamalcar.com/userfiles/file/zizobutobes.pdf
    • https://salonrewards.ca/images/file/35524422842.pdf
    • http://istanbulballoons.com/ckfinder/userfiles/files/59346695461.pdf
    • http://ageofwonders.buka.ru/sadm_files/kexatuxuwufewizokexawilo.pdf
    • http://totoumi.jp/upload/file/3927295246.pdf
    • https://almentispharma.com/ckfinder/userfiles/files/xujafexojawunik.pdf
    • http://www.golfusa.be/userfiles/files/tebipi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=generate+qr+code+for+wifi+password
    • 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_off0000e0fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FC 16792 bytes
font_01_sfnt_off0000f90e.bin
4251367e431de6b782594a6f81fbc72779544b6f88a36fee428add38ac8885d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF90E 17764 bytes
font_02_sfnt_off00012755.bin
085d945bfcde23ac7df224e6d8dd08ee0bfe65a7dd9097c3134b947dc377e7ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x12755 10836 bytes