Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18f8d59cc16038f…

MALICIOUS

PDF

86.2 KB Created: 2021-07-05 00:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf9bbb01ec94a2211eded3d144c0c10d SHA-1: c90b5ebdb6a6550540715dbe3c1ef0978c1813e9 SHA-256: e18f8d59cc16038f2a18f96d4e8e601784fb51e7f5e408e766f65c58acfc293c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is intended to trick users into making a phone call, aligning with phishing or tech-support scam tactics. While no scripts were directly extracted, the overall structure and URL patterns are consistent with malware delivery or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://huntic.ru/uplcv?utm_term=accounting+intern+resume+example PDF link annotation
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/1i8ohpu2giljdnv835q9jg7ks2/12280115326.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3740de1df---jikewepex.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086e7de9cc04---10180979428.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/23k5t6n4dhetit98o2qefr54f4/bezakomojaliguban.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/sifefazaruge.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a233baa4917---56917319541.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/14bf0b62a3a59034d0ee38e2d345e452/rigilogi.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2850c9e760---43345136146.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160944d6c8e22c---49266830776.pdfIn PDF document text
    • https://cubic.is/userfiles/file/jilupiwaxamikuf.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6fddf0327---fojepokuk.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/jejobudupekabopoxos.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d421fad927167da31e96c8f3be211af7/16048981035.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7e50800c680ee5ddaee5b77657d321a6/pimopufopuduruvuka.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/41387241314.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/vunaponepufilodab.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/097493d547767b46d285914d238380ca/45923769864.pdfIn PDF document text
    • https://energooptima.hu/upload/File/19323513521.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/677d357b8dd5d7f22f921ea9e602bbd3/vagivenovudejo.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/kowopozegeleso.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/09f793292e7053f5bf81d1a81784df46/96084397696.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68918606159.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/e38aa9210f58aed36b57d6eb885f70d6/50812809351.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/nitelagotunilidokosi.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210603221122.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_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 17028 bytes
SHA-256: 3a51dfea4be1a0fdb9f0b2826296008920ca6731ca58922f8eefd2ea181fd7e6
font_01_sfnt_off000119f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001320d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320D 10900 bytes
SHA-256: 2f3906eccc48ed012794b90acf5ec3c895710b0bd8f921d48dd37ead7fcbb124

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