Malicious PDF — malware analysis report

Static analysis result for SHA-256 905f31e66ccc94ff…

MALICIOUS

PDF

104.8 KB Created: 2021-07-01 13:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: c5395efacf2957600345cdbf61eee64e SHA-1: 66ce4f7df782853c8eb170d30205b25f491e36b5 SHA-256: 905f31e66ccc94ff3b28841102e2debf9f65d3e8b06ef159179ef071ffa12508
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 likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution mechanism for further malicious payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/8837d5d9d159d3590cbe9a746ad5ed66/64384253071.pdf In PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/36hfsldlgotr34t36idfc3ocd2/tanowevovezubavamo.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8bdb1893f97e5ca90ac9e1eb2ffc8078/61970708909.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/fhnursrkj2gfic6qpf21s4kal0/biwufemularolafebigu.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe76802ccd---zevabu.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ba4e8daf0---fapudamuwajovejolegod.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/fazuvuwu.pdfIn PDF document text
    • http://arablift.net/userfiles/file/bamejetuzex.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/edc24a0068f094200c8a37c00763fb54/rupiwakajuvezaguzeguxexe.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/wavidabotutaxipitip.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/tupifovazomas.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160762b52281c3---dabiwulugewizalunipuripi.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///34055132354.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dfce8204a---32760913982.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071867872b38---53392524962.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/s928vj807u5npqkc306p1grdu2/jipitenujix.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744d1d8ed80---38196951751.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/e28989902ecb9a724310570177be5e6e/792834265.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/78830727109.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/jegonamezefelivajuwu.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/0b1aikphkh5k8u74kpokrrp6et/84284979780.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/fc149508754b8960b248cd5bc1757d2b/96432573952.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/54515997591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=use+of+a+comma+in+a+sentencePDF 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_off00013873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13873 17068 bytes
SHA-256: 52fa2b5c7cd719805057716efc0b2eea648b59d34fd012372218f0df5a503512
font_01_sfnt_off000164f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D09 10356 bytes
SHA-256: e31d87629bbf154461644799e340d06d01040e1184e4bcec6703a8ceaa81ace5

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