Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d0f453288db4d7…

MALICIOUS

PDF

74.0 KB Created: 2021-09-20 10:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c5b4efd840e28f64d9473f547632b73 SHA-1: a077aa129e65e84f8453771e0af4938d91acde7a SHA-256: 75d0f453288db4d7f13749d1671baa81ac4b24ebcf1eb621158ad3135a613009
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of a 'Callback phishing phone lure' heuristic suggests the document is designed to trick users into calling a fraudulent number, likely for a scam. Numerous URLs pointing to potentially compromised WordPress sites and disposable hosting were extracted, indicating a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=videoshow+no+watermark
    • http://mlead.net/images/e/file/98057450196.pdf
    • http://abwvictory.com/uploads/files/zadin.pdf
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/nojebugovazu.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f946163a9b---35130213248.pdf
    • https://millersexpress.com/userfiles/file/51713621794.pdf
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39644596062.pdf
    • http://dkind.net/userData/board/file/33823064298.pdf
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210907_105233.pdf
    • http://szjwwj.com/userfiles/file///ninekuzarugonudunolog.pdf
    • https://thefertilizerequipment.com/d/files/wimob.pdf
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/30129978432.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b96d4384d6---waxunaxisafawasoza.pdf
    • https://ap-qatar.com/userfiles/files/tokonixamul.pdf
    • http://vitanova-cattery.com/upload/file/lafaweronanosor.pdf
    • http://japan-railpass.info/images/blog/file/38995708247.pdf
    • https://hohsingfiber.com/ufiles/files/65367611588.pdf
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/25352164995.pdf
    • http://severstroysnab.ru/userfiles/file/54449715291.pdf
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/37261668915.pdf
    • https://artedelvalle.cl/gal/files/file/30286576728.pdf
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/gekuropimakedurexukomuka.pdf
    • http://sobinco.cz/ckfinder/userfiles/files/nitelamewuze.pdf
    • http://esistore.com/userfiles/file/tojoworaxejaxowudijigod.pdf
    • https://vicotelecom.vn/static/source/images/file/14585648617.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/dd61f6a2d6ae16ebaafad3d5329378e2/77059169404.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/61dde452ce7ed42df1c288242f88310a/visijujuworezojod.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c11e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC11E 16792 bytes
font_01_sfnt_off0000d935.bin
e7c7a86483ed58fbe381481e51cfb80e5913137d5553c0d9d13876324ab25b82
pdf-font-stream PDF embedded font (sfnt) at offset 0xD935 10616 bytes
font_02_sfnt_off0000f158.bin
d8bf747a9dcb101bfed550ada0f054f284ac1744a35f6dc157286cd29d378d21
pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 16088 bytes