Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04ea5157a107eae…

MALICIOUS

PDF

94.7 KB Created: 2021-07-16 13:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd247a3deab58b7ff903566cc5525390 SHA-1: d0a77b703a4423a23335ce281f3fd0d97e7e5f43 SHA-256: c04ea5157a107eaeebaa71a9f6042de4b246ce44f938af5b534a93f76cae068b
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised websites and potentially disposable hosting, likely to facilitate the download of a secondary payload. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778f5b057ca---bidarakufikikukududuk.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160932a884fc34---pevesitimatijidibilip.pdf
    • http://stlukesmn.org/clients/17773/File/lolusesajuxagarejo.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/89509843644.pdf
    • http://tksvolga.ru/userfiles/file/zagumuzinunepovara.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072517150301---vunasini.pdf
    • https://adikkeempat.com/contents//files/53142766010.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c871fe5ffee---99356185540.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16096f5095a43c---pipomimebi.pdf
    • http://chistogood.ru/admin/ckfinder/userfiles/files/xetisamokofapoj.pdf
    • https://thuaphatlaihoanghuy.com/uploads/files/dabase.pdf
    • http://wannawwannie.pl/userfiles/file/53409739732.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089de7fe0516---32951680353.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/oclvkrsjc54tntirk83nefr504/44438090009.pdf
    • http://gyobel.itpublic/file/11106553712.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/560cd295ae4363e7259b351e815d58ca/49431868511.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791695533f1---vowimetilojufop.pdf
    • http://feynburg-uhren.de/uploads/83418287641.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/hjve1dni8n4nlo82oe6nv1bjo6/53188192712.pdf
    • http://atomleasing.ru/media/File/vutewufesow.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/aa49c843f7a13682a2b13a18efe5e0e4/nejekosasusajonugawowano.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160de46d4732c9---vijatosunawifefojefixibu.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bfa5ac3e0---92023976547.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/522e99453a9e03c18b3bf6f819bff541/firateg.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=titration+of+phosphoric+acid+with+naoh+lab+report
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa74.bin
d991ca5104b5a9c2cb506e54eddeea59b46d1b0e0a8c64dfcdf2bf73aa830f06
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA74 16784 bytes
font_01_sfnt_off0001267a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1267A 16792 bytes
font_02_sfnt_off00013e8b.bin
a31e141fb2917ac6221449cb8c95e700680d048453672ad8ad57cd6853c5c53b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8B 16108 bytes
font_03_sfnt_off000153b7.bin
152908019b57f2f0d54041ca463d092d48d499a33883123edb9a733ac9dc408d
pdf-font-stream PDF embedded font (sfnt) at offset 0x153B7 10904 bytes