Malicious PDF — malware analysis report

Static analysis result for SHA-256 039522e6a710475d…

MALICIOUS

PDF

73.1 KB Created: 2021-09-05 09:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e3af2a807962756122ba2baa1f46901 SHA-1: b915954d385aa0cefd5e2eccb8d90bf0d6bf1f7f SHA-256: 039522e6a710475d80f6d02491aa94546082c2bdb2fe61f14dfcf4f46171c579
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to obscure malicious destinations. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://j1medical.com/uploaded/file/10254994509.pdf In PDF document text
    • http://hzdshg.com/images/upload/File/zuvopuxovomox.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce65b3afd5---bisavitekutafi.pdfIn PDF document text
    • http://davcpundri.com/css/file/sivenajipanux.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021080923430269.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a6ae323f1---binobazepa.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/20193538964.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/fagope.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/78242914262.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e9a4cbc934---71745583846.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/20329877599.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/79509393645.pdfIn PDF document text
    • http://tipiland.net/upload/file/40357293175.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/nafelodesenupikosunebamu.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/mezubetula.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/oj8h5lokbktmijb655rs7hqjn5/duwonidalujenexatoluduro.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/sevasonuxu.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c8c99a59a1deab9ac5286c7d3b9a39a7/mamadaneri.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/97486c52f2d00c3b2f9eb6d2b669faa6/lisefenafebafade.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab74d0c7f59---43328363836.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed8b070d9c---wodubagasaxibimiluzewoku.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/84467603795.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/13502bf888919bb3b42611b07554da25/48018506039.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/wazegerofodasesukavor.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suvexinokowibugulofafojur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gcf+and+lcm+worksheets+grade+6+with+answersPDF 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_off0000baaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAA 16164 bytes
SHA-256: 6829493a68382f1e5c48b054c9a4ab4c155c11ba5a6596909f393d0f31946f0a
font_01_sfnt_off0000e416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE416 11308 bytes
SHA-256: 2b1599826e32a806ba0eadc0ac00ed4939e5759f26f89122570d919e6a490a71
font_02_sfnt_off0000fe5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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