Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e0fc3ae9afa7b3…

MALICIOUS

PDF

112.9 KB Created: 2021-07-20 21:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 84545fcc62ad0eb9357ae4c8e0bd4cf8 SHA-1: fcffe231fecc47d74c79adac8a7bdb96324ffbb9 SHA-256: 93e0fc3ae9afa7b3325b2f317cdac9b6b4e8b8e87b12da6842250c425eff1577
196 Risk Score

Malware Insights

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

The PDF contains multiple links to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malware. The 'SE_CLICKFIX' heuristic indicates social engineering tactics to trick users into running commands, likely to download and execute a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary attack vector appearing to be a phishing lure disguised as a software download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2b647d638---39441403620.pdf In PDF document text
    • http://myucmas.com/userfiles/file/siwifelo.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/soduzijipig.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/zegesunabiwowutitekovid.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/6hppp89qtbmue7esov3d9vguo3/kadawukawagipiniwe.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/96624327581.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099e177c5f5a---10198722059.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/0c2b3b91f1b3c45c69f904233a86aa25/buviwuwogekexexobite.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/62177827300.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/suxajoxijejevojutuzetup.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/rfa9qah6ncoh3qc0bd0rqllhh9/wuvurowuli.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/luzugonobilukutum.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160700d83714cd---31371778034.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160814bc108053---wopevufobi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/mevmc78rrunqn6150cuosbcj42/12835233223.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dd78b032bc6---vutibekujimokuxatitin.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1bd089b342---vapimijosaxilosixalovava.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/sikoponesa.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/cfac0f0a5ab1cf93995318b844d60701/35939732973.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/nuwirajudufibalepajidag.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/9da617a7ee875961ba7dc54824251a48/sukav.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/bimuxera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=adobe+photoshop+cs5+serial+numberPDF link annotation
    • 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_off00014723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14723 11136 bytes
SHA-256: 28815ee5bb3b0902d0e2aedc2cd8c760d870ba8a0e64133d98f9a307c57c9660
font_01_sfnt_off000160b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160B8 23988 bytes
SHA-256: abc8a81dd3ea9ad95fee7740d3e38549a7f02bc84079a4236719cc359a66549f
font_02_sfnt_off00019c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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