Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a85a4b01daa09e…

MALICIOUS

PDF

91.2 KB Created: 2021-08-13 12:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 684bb66dfbcc48a27e4f36ad7426a3d9 SHA-1: 4b03c15304ec2cd24d0153e4ac757f0979693002 SHA-256: c5a85a4b01daa09e2bf3e9dcb36950e2ddb05a0e0e8d4357798a92767aa1068e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huyminhplastic.com/upload/files/58494076772.pdf In PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/65045341786.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/sogoguxuluxa.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0f59a628f---jimuzibirewo.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1bc69a057b57651fd21f80f3ed19fc9a/durasevufozolaxeranolif.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a17b51d27---66753162554.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d1447830a---34393260588.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/2270595763.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbacf6b2f3---11192615521.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16112753f78a1d---64731764273.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af7c2adae95---vajevoweregus.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/99826569119.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/gewufobofitepovabujax.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/dupapimodakivowod.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/36566db69fcd61e8d47aa4860c7387b8/zatodemezidozumofa.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/zadaxalozup.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/17aaa90878b125e7782c325ed59f1a45/fiforejuwuvaxer.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/rcc92gssok86assp5dae4krqn1/51416323821.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/4vgqkg6dv5dapiqe392b9941qm/96126396946.pdfIn PDF document text
    • http://becucci.it/userfiles/files/56427239614.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/tp31cd936mhpvls1o0f0buh2ue/fobowebosukopuv.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa80bbdc0e---tepatemanolamubuwugum.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/15696857587.pdfIn PDF document text
    • http://honda-vo.com/upload/file/kajajipiruru.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/nuramotamekipulizugekub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+dr+berg+eat+in+a+dayPDF 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_off0000ff18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF18 17560 bytes
SHA-256: a0436a919ee0a167b49ee2bc418cdbc072ed5ab004b23896728242a66fe1a155
font_01_sfnt_off00012d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14561 10440 bytes
SHA-256: 7432e287ae4e6baabee7db1be70ec809990313ffb956a7c7a1e2c021cb60b674