Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d6f158db1e138e8…

MALICIOUS

PDF

85.8 KB Created: 2021-07-13 23:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c51604a61aadb1a1a78d8200646a4fb SHA-1: 3653a224f9b98c59b591ae51cb00d85e036bd7a3 SHA-256: 7d6f158db1e138e8f281ea9353bc2641877fc0586042be439a0c8d767d40fe5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://jordanadams.com/ckfinder/userfiles/files/dametadelese.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/nerovazelumaxobisotif.pdf
    • https://sonntag-immobilien.lu/userfiles/files/86070818491.pdf
    • https://onhimalayas.com/ckfinder/userfiles/files/nutajitowiloxojetudita.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b3dc135b---71440271154.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/9811092672.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e68aaf23eb---badufetevuzewezit.pdf
    • https://datajournonepal.org/files/7541639621.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160893256b5cba---87303067587.pdf
    • https://creativitagh.com/pevron/www/img/file/59424385129.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ikr347q5fs50hod8agh0t4c9r3/xujinuzitemok.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ed3c72cbb---vabufaduxuxu.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa13b6e7fa---kozikelasevesetopeka.pdf
    • https://prtl.pl/userfiles/file/kaxigozukufef.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/coe33vrb2hvqqn3sbdgjm3guvt/12648150810.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/80e37397a4b5c59f5de537b6da6679d2/gajetukitim.pdf
    • https://davaocarrental.com/images/file/dizosinusijepi.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/g421c7a7as1pvos78i7m6l6q79/7643561575.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/b0af889b489db941f970cf7ea30173cc/5048306029.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/2333744ed1d52eb0cfdf311ea1c419cf/59097621144.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4457e37608---37699109396.pdf
    • http://staropolski.net/Upload/file/16218757917.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/87e14a08b95a08bedcd9cf811c43e12c/34803508247.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=five+levels+of+organization+in+the+human+body
    • 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_off0000ebfb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFB 16792 bytes
font_01_sfnt_off00010412.bin
cd9215c15f99d22e6fc4449136292f15dd18ee09675dccedbd4f083eb9221889
pdf-font-stream PDF embedded font (sfnt) at offset 0x10412 11260 bytes
font_02_sfnt_off00011e27.bin
eca91ce785d60aee61d8f244b1a4b739898288c19065139d9e9e72cb524c0876
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E27 17040 bytes