Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d1d65f226ec2cf…

MALICIOUS

PDF

143.8 KB Created: 2021-07-25 02:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 430345b656a28ce684fb07855fd0bb2f SHA-1: 777eac11aa9e98c4d532541b382ba1fd13514c85 SHA-256: 37d1d65f226ec2cf7ab4f1347906e0e7fca2e6b39a11f051d52d9b6f13cc25d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to multiple domains, many of which appear to be compromised CMS upload directories. The presence of numerous external URIs and the use of disposable hosting indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/07361e67dc777b52081baaef7eee37c4/79017396044.pdf In PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/9a54e7573277c6236761701ce7ce3a76/vatezojefikiwozavebaf.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/60271921676.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/aa5ed3b45727f8df6cc5c57fa5ef019c/zujesunaretesil.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/vagidamunif.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/12732467471.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/femulinezuj.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/zewafosebaxapogikoladu.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607580a6dcf7c---698736885.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/sepurarugidexebilano.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/godamoxogelagezolisijutef.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8937cc089---korekimamekodat.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160e4cf65b8817---99919802498.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/a3m962ejjdueaoeod5mo2sk434/57944006421.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/96383643342.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/fejubabubatubala.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/5r6afr01kulcfid9et49fqt1j8/11007425638.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/ba23ffb3889b8415c5f13086ede67a5d/25737047176.pdfIn PDF document text
    • http://centronegozi.com/public/15386974645.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/423dfd0f3df6f6d9da507516833d8a03/68212183133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=are+challenger+rt+reliablePDF 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_off0001cec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6D4 19840 bytes
SHA-256: 489bdd549031238a2e26068fc0486753a97ec25201e72d128344d54fa013baad
font_02_sfnt_off00021a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A57 10344 bytes
SHA-256: 68aaa57a21decdd2607c287b48edac4b01e3dd3234770eb9fade99e1ad1d919a

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