Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd81f2150f2924b…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 05:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 900dfa0d8f01ee8f6c331501b6bbb13c SHA-1: 92c80327b896e8adb26a66b424dc1aac6535b3d9 SHA-256: 4cd81f2150f2924be9d037dc939cd7abd1cd4b97ee12799deeb4eb71554c994c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites, likely to distribute further malicious content. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it is designed to trick users into downloading malicious files, potentially via embedded JavaScript or other exploit mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irantruck.ir/data/file/75503793084.pdf In PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2f8e4bba5dcfe706f81b68323a72a5d5/35818103770.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/98751842514.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/57177225519.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/zarizojatoniwus.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/923f9e98c2006b4962917c459433a86a/wolisukaramoxenapigo.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/73746016468.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/13863308187.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/30371856769.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/pulelusujaxoxoj.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/50028214291.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/zalefurakepowanadosuwa.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/deterizodutaxamawulak.pdfIn PDF document text
    • http://primaneighbors.com/userimages/tojenu.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/6doe3r95l9ld5oovb35e5g9ra4/97530144409.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/sifexumedusokigi.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/26ae9c99b9968177866020b2e201e09e/9666641783.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/1df16c8ff140193ddc9321281ebc6d04/lakuliwilo.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/8806610439.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/59904032745.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/7691018c69b70d8d4fa39ce068d34ae5/wagemip.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160956af11853b---zivufuxirumena.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01768aab6b---dagewakinesixulemefo.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cd6573bec---dotapivixejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=computerized+accounting+packages+pdfPDF 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_off0000db0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0D 11200 bytes
SHA-256: 31509f157e26f4877806d566a2b335b5d87f76255ddb07cdec41107b11564f79
font_01_sfnt_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 17308 bytes
SHA-256: a125a726854845c03a76e79a7d5b59310942f299d4499478fb66b3f4d44681d7
font_02_sfnt_off000121e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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