Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdfd000d2555f633…

MALICIOUS

PDF

79.3 KB Created: 2021-10-04 14:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4c161241cf590a534364000c3610d9eb SHA-1: 2db807e8f2e6155feae7c5f701db29f82ffa5f4c SHA-256: fdfd000d2555f63363b7b35b6ac67b486e3fba9ad633b8de07573e894cfaf8bd
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms or compromised upload storage. The 'SE_CALLBACK_LURE' heuristic indicates the document likely attempts to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the presence of numerous external links and the callback lure strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://laborke.ru/uplcv?utm_term=icd+10+code+for+pulmonary+vascular+congestion PDF link annotation
    • https://profession-your-dr.com/uploads/files/202110031428413174.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/88310564674.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/labozerosajidobesomis.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/pasireralibexizuzabekusa.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/35369494653.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/52169215549.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/73589478899.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/36606948951.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16157009a417c0---75230483649.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/tqfbjlmebdpqeikn56cir52ss5/91376997838.pdfIn PDF document text
    • http://isvpro.com/custom/files/66085547074.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/19069956687.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/6906625554.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/36521731929.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a387487b6038a5d70230bf5ba11bd23e/kemimituvimen.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/gulijulixesogovurixenet.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/99726282718.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/f8490aa62dbf93527f1484f83cbdc427/31856012359.pdfIn PDF document text
    • http://www.siposferenc.hu/html/32108273205.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16139d5c3cfb16---87937194180.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/53813575998.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/27192697727.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_off0000cd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE526 18392 bytes
SHA-256: 396c0366e111d060596608d441425495da7de29a86affaa3372536eb8217e928
font_02_sfnt_off0001151c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151C 11368 bytes
SHA-256: b2e5664d8d69282d49000a701f3720d439b164b528cf0a4a33c79401069da0a6

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