Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f1593374816421…

MALICIOUS

PDF

75.5 KB Created: 2021-09-04 06:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 73ab04edee13ac9b73f15b08257911c0 SHA-1: 869cb4e2d28959cb31eb54f1f1b2343487a64a81 SHA-256: 38f1593374816421717aaba33cb477e0a094f168a6f3494c7cb8092e478dab4a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites. The primary function appears to be directing users to external malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://infrive.ru/uplcv?utm_term=what+am+i+invertebrate+classification+worksheet+answers PDF link annotation
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/de4fd01bfdb915d27e1da5f001e15515/munivalebofojijor.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/xelajivivebafi.pdfIn PDF document text
    • https://inncredel.com/uploads/51633124961.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1897d7c7bc---59873520417.pdfIn PDF document text
    • http://vodnik48.ru/content/file/49010901708.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/vifonul.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/02dc580651025e06694f136ac3fc2780/medolur.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/jlugo2l2v2ek416s59ikojd5v8/ralopuxufo.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/5d0a1604708b1f94ca35eadbf735518b/58993757357.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/76676027910.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/pumifiguzewa.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/bisibesibowamogesed.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/3469c6502b56c7aac98e5bf56a861fc2/98200779709.pdfIn PDF document text
    • http://jhroseclassof77.com/clients/45984/File/dawuladikefinalefabaz.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/29070055093.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/61285585456.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f8cb8df16---vemidasuxowadavura.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/59339ad3a57bca1fed7df365535ffc45/89999690878.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/zamerujovebo.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/buribuxivudoduguvepa.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/391f4e792cd92e833d35b4d5cd973a59/jipurabinaniminanagipuza.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_off0000c143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC143 10980 bytes
SHA-256: 1f83ccd929ec344c084df799960b7b5b1aac7c32958a27dfe9b49a79b5ed7c2f
font_01_sfnt_off0000da94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 17272 bytes
SHA-256: ab7f36ee72a3565866abd9fa74a24ccc81dd578e8025d1c5a8d5e9a5c2493a09
font_02_sfnt_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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