Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c3fdd4439ae4ad…

MALICIOUS

PDF

85.0 KB Created: 2021-09-08 15:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b990ca57278c3d1a5536916c684a1343 SHA-1: dc8e403ae9261f8d695cbc227b2f43ca89789a23 SHA-256: b5c3fdd4439ae4ad5a1424119f942d551274c6d2123fcee669290a86cbae6194
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URLs, many hosted on potentially compromised or disposable domains, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded JavaScript points towards exploitation for client execution, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://pixomot.ru/uplcv?utm_term=puzzle+questions+pdf+for+ibps+po PDF link annotation
    • http://oldadmin.k12cart.com/media/files/30760439740.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/penezuxokibonon.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/eksjpme8ecuc7lv0tp7q6ql5q2/70796811799.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/84371934377.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/58646732532.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a634bf3e51a74018871c9634ff6913f2/17998024907.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/73866945037.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210908124952.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/45022583121.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/bodapidajowod.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/18964935934.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/61078552356.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/geloradevov.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/legexulo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a7cebd2fd---9581103522.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/norufu.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/totelevebowure.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/24300580214.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/siduma.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/fekubowimetorogedomul.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/22993699018.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/vifotafuxilowolirubum.pdfIn PDF document text
    • https://frisch.ro/files/file/fevibolilufufetokamox.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34D 10776 bytes
SHA-256: 0c3126608d8b5f43e184463ffbb5356dbae7aa9316ef671e006f97d601b68761
font_01_sfnt_off0000fbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E0 19468 bytes
SHA-256: 4374cf2b654abe3d3f299230c107f1f3120386267e47f0bb3c86f26bf3d127b6

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