Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4b3f838973c1b1…

MALICIOUS

PDF

87.8 KB Created: 2021-07-13 07:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 90d778ff9d8082146f27c50e96421f2b SHA-1: c750016bccf3e903e38b02a48eee26c3a081bce1 SHA-256: 6b4b3f838973c1b174c0c790460b178fb902839754732ae0fe6dae0036a3b9f0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised CMS platforms or disposable domains. This suggests the PDF is likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://djarkitek.com/temp/vinney/HTML/userfiles/file/57107589860.pdf In PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/6ffa890e0182a929faad0f41055ae328/73030347358.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//55208891576.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2df62504f---xawidaku.pdfIn PDF document text
    • http://arablift.net/userfiles/file/84486665135.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d633720535---ronefozadokifegej.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/b8be0b6e4562a77f4d6bc4398b8980c3/nezewalaxogijevomagotex.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/8u3d8j061pb5hh41t034g9qff7/rodaradulosawupiroxeteb.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/61941785420.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/kakokurudilas.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/18234713419.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/01196893482095daab33a5b78f67d8fc/86480165518.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/5c95cf250f92efc79b8647600b01b55c/fojuruzikowisoxivok.pdfIn PDF document text
    • https://latework.cz/soubory/vosupinokepetefupipug.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/67846757011.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/12692218268.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef157a1612---10967931483.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a85cd4d092---gosori.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/c1a673ee1d19757449441d3ebff7ef7a/25552294340.pdfIn PDF document text
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/batonexopopipa.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2105250116543501605gmrju.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/16933012683.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/23665333370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=bmat+practice+questions+and+answersPDF 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

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_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 16816 bytes
SHA-256: 824ea660dd1480615672fe20cf539e7804a30ea3c7973b95bb4ae8e73934f369
font_01_sfnt_off000120a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A4 11016 bytes
SHA-256: a04d30bbf72a1c918d0eb298f47d6ba036b753e8064d6d5b91932051d840f97b
font_02_sfnt_off00013a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.