Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df44c7429d418d2…

MALICIOUS

PDF

93.4 KB Created: 2021-08-09 00:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a796bf3ef4224c67852750d752affa7 SHA-1: fb4690f9738ea01b2998a0a3fb5221e3b7cd5f1e SHA-256: 8df44c7429d418d2d0e3089cbbcbfa1fa7cdd3a88bf5efd8465a34c8105971c4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://oniceh.ru/uplcv?utm_term=bosquejos+biblicos+para+jovenes+cristianos+pdf PDF link annotation
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/dc71b15be37d4a376832f15fec60c7fc/1230312570.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/5d40cfdd324ca3523095d0628d8d3089/sejovojukedowarojekavomej.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d3356eb05b3673276f7a2e58131ea491/ribekuruzatarodinakeralug.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/99302204425.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a0d10f47---91528989546.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/fiwebevekex.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210613215113.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3j5uhjjud8o94ehb51qdjq0r86/69753954381.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/da99054abfc3c9fa40c489172e073d39/92565612611.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab398979d58---40462888161.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/47714260571.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//gomazalijap.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/96606850012.pdfIn PDF document text
    • http://flirdining.com/uploads/files/sigusifoganu.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca76bb312e---10058124579.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf20059cd85---68207883130.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/6a9b52d19197177575be49b8e6407bab/kibegoselizobe.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/fusafakusi.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/92529608175.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/texijajixezesarakax.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/kadopabivixesebikuki.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/memepalobuwe.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ec8a964117431275fee96d9a0fd818b1/vugulitisawuzavajodi.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/29b89028e8b273f9d242e0c638cf5859/14209961769.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_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C98 11248 bytes
SHA-256: 80d00d3177d0df78e29ca9726a581ba4ed1abbacd27149130375e5bd22111758
font_02_sfnt_off000136b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B3 18548 bytes
SHA-256: ddb0341c9dd68b952bee5df20f394ddc577672da12b38072a6e1ccbfe68a7149

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