Malicious PDF — malware analysis report

Static analysis result for SHA-256 d053e4238d41e281…

MALICIOUS

PDF

153.9 KB Created: 2021-06-27 01:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 40b6d90cd653ca1b6f97451bb7920d5b SHA-1: 5bddf90e05d10b75c4d1e8abdc8bdb1757149c35 SHA-256: d053e4238d41e2813791b011ba350b67548f55420d36db835719a24cb9a06158
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. This structure strongly suggests a link farm designed to distribute malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 6

  • 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.
  • 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=triangle+types+of+triangle PDF link annotation
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a04be851e9b---jodarovub.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ef27b21d1---50536698998.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f96e2696fe---zividugemebesare.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/m3cq24l1tt0vnc16kkeq913iee/luguwatixusuralemugu.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e160e1ddb---71506435336.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160959872cfebb---xudoxe.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/42514703101.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988b6811b60---90501221548.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/33b665b56a9bce86f9ebb3fb5759add1/jazinososozavifet.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/fd013c4f67958a2b32ac93e29f4c02ce/36044433970.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/54656800921.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/mexitaviwakabaxawaji.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/97072585425.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/53b412ee791c11e381f40bb4fa9c08b2/texikip.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/bc308eca9215ba8625efdc686113c5d8/senelawematozisefatus.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb3068a417---xatomofapevusibeno.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/90450839440.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/704eea60f2590df0dc45b11b15e253d7/99560674060.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6bb87c3b9---zekezira.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607145ed0ed40---38991740708.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/03ddd3e6deca303d6d97f5c4b05a4dc7/bijaxiwajazililopavidim.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608b938b8f70f---verewavinalivenibew.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b73c71ac10d---jinisexafomunolum.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E8F7 10612 bytes
SHA-256: d8ba1e5a42e9966b5c006c83cf9d51232293e87fb8e620796ddabfaea9ebe101
font_01_sfnt_off00020158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20158 25304 bytes
SHA-256: 7b3262544e8910cee8bcf210403ddc26a9a74de2f40d59af90b9a8a11ba8ed8a
font_02_sfnt_off000241f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x241F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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