Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f38a00a16929fa1…

MALICIOUS

PDF

86.8 KB Created: 2021-09-07 01:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c750eb7f0b490c1a6eb1ad6d3d768260 SHA-1: e26667d0cc6a4af61bcffe55cb73c300ea0b5cf3 SHA-256: 7f38a00a16929fa169d9524eb13a53b8dd686d208a076616c349542e0aca0476
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to deceive users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://stalmont.eu/userfiles/file/63184387194.pdf In PDF document text
    • http://hagelkonzept.de/userfiles/file/mavufekaselubiki.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/998f7b3b78a0218bb9b34a70256ab78a/10560098367.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/zasowodufukubu.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a9b6be60b---24696594330.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72622669666.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/62456521483.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851f5f4026f---fomozukavutiwiwime.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/95487385319.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16098c14c5bd98---50817149628.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/23321564183.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/gekozewanotesilawij.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/6ge0i8k1mt7po9bac6rm3q7je5/tajisubokoletipolunapipof.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/21poaj5t7g9ivvis786p5pprv0/kaxezojo.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/12972871721.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/45901842216.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/tovosojolifuzadov.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/vedupuz.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/32b7d3f96268ff59be6d40b4efbd0fbf/guzuxiposepukane.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/24047240933.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/91221999618.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/taxunoxigajomavevi.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/18226100278.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/30315843677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=kingbird+highway+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_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 18816 bytes
SHA-256: d7a590493d19cb1844d347f4b7dd6bcc965597b9fbc1916858e9b8161bc9257f
font_01_sfnt_off00011ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F3 10544 bytes
SHA-256: 0ec22cca3f18adc8937f4303085886538efb1d4ed05aa51dff07689015d15c66