Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa2d104c4f911f9…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 09:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ed3cbfde2de547ec807c1737c455f48 SHA-1: 54a0f5f5b3bc8c7ada630279efb8128eece5cc82 SHA-256: 9fa2d104c4f911f9a9f4fffeae011c653c5d7c32264f9ba9a0abbabe55f4af58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://crysiq.ru/uplcv?utm_term=716+sports+cards PDF link annotation
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/hd5tj3rggptceml45igbse9otk/nejokaxuwituzepifiritar.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/nudusupanovunavuza.pdfIn PDF document text
    • http://mobilenmr.com/files/files/39164644617.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/76dc1b01b2fde68e0b2df0d2c44af57f/64562154354.pdfIn PDF document text
    • http://soles2walk.cz/data/file/29101692594.pdfIn PDF document text
    • http://cochemical.com/upload/files/32666785745.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/28946934228.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/julizosepojojomisabaz.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/4id1bjcp6kae0h96rmf3kdmgpq/9638850966.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/80934231351.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/44654345682.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cb2d3ad47---donufadefenivob.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/kepezoviwiwuvojorujesesa.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/5875788624.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106291712384365.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0809/ed14864ae07103275d48d7ffb17e63f1.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/57609834406.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607abaaad319b---pifegisun.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/kisemabula.pdfIn PDF document text
    • http://i-dron.cz/data/file/7177147683.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/jazopamureliritofefu.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/40970738298.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC14 10304 bytes
SHA-256: 7bca4e9959c466c915155002ded750bfd701d5c4b6cb89774dfd7f708f71188a
font_01_sfnt_off0000f383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B95 18520 bytes
SHA-256: 2929b0f95170e110c0049c1eb0c51d280f3715dcd2d4180b57fc30c35fd30a0d