Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54f22545df5bbb8…

MALICIOUS

PDF

75.9 KB Created: 2021-06-25 17:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 099ca38c68ad58d9b0356e010fc28efe SHA-1: 06bd20472437b566d10bfed480137b6a12eaa2fb SHA-256: a54f22545df5bbb882c0e2ebf096484fea670e360d4ac98e2ae07e96a3e0b7dc
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that redirect to compromised WordPress sites, often using link farms and disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document's purpose is to trick the user into downloading a password-protected archive, which is a common tactic for evading gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://synerhu.ru/uplcv?utm_term=a+submissa+pdf+download
    • https://organicfertilizerproduction.com/d/files/wujigamipaba.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/cf619cf5384708419450b7efff6a1b31/mizixavidipa.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b853e65b32e---jixutuwuguvegem.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/a913ca58e5b7edd4df6486d17b8a6ef5/nematedesufi.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86b0e81a4f---negajemube.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/mvn5abr9quv8h36aocermdv226/22605779297.pdf
    • http://samrayburnclassof1980reunion.com/clients/873185/File/59291600826.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/acb7ml3h4geu8j2qpol1jpjva0/60776273694.pdf
    • https://eastmanllc.net/ckfinder/userfiles/files/wasigelusuwifo.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a45aa7922d9---nusovifarilefumojak.pdf
    • https://implant-drill.com/userfiles/file/ravomuwijotilexufofowusi.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081927a94e97---77542593512.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/j934ssbi8acjjl59j8l7bfjdt0/97120700029.pdf
    • https://thuaphatlaihanoi.net/uploads/files/tomogixigetosiwiruwawo.pdf
    • http://moderncarrent.com/user_img/files/guxuvazedoneruxe.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b58404c0211---dusulujupu.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/e0bae910a014aead269dab7f00e2578b/82016129211.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/3ef3ad6c51513c94a8d3cb941d686530/xuxojegusugalinog.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/03600ad20d35c5a193d9f370d47f1d3e/56052689715.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1111f20843---66705718716.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e7320e1c8---fowifikomovabepajeg.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/7dd98c9334989d0451bd520c2f8772f7/1365678790.pdf
    • https://a2designbg.com/userfiles/file/32329136152.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/f1364d8889c1c8c55cf94cbc08e90b55/213870089.pdf
    • http://razaviota.ir/basefile/razaviotair/files/modavamujovewusaguwidepi.pdf
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/wexofu.pdf
    • http://alimentosldm.com/userfiles/file/faveresabagasazitisinefa.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086940165ee9---73580451362.pdf
    • 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_off0000c5e7.bin
4298c20b463b53a819377c904b6cd675e9d639506a9a08977ae9965028c155a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E7 10636 bytes
font_01_sfnt_off0000ddfc.bin
6c027cdbaefd9d78de95f289f6acd5df8f8dd561ac6d6e7e27649c2399210838		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 17648 bytes
font_02_sfnt_off000108ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108CE 16792 bytes

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