Malicious PDF — malware analysis report

Static analysis result for SHA-256 f037c4d834ec924c…

MALICIOUS

PDF

83.1 KB Created: 2021-08-23 18:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 420ea30a145f8a3d922fa73381a2840b SHA-1: 7a61d645c56fb81638d16eb5d726550070b909c8 SHA-256: f037c4d834ec924cb31b99fa58a76ffa107f03e4374e06902563620960d43d16
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious content. ClamAV detection and ML classification confirm its malicious nature, specifically flagging it as a phishing trojan. The embedded URLs point to compromised CMS upload storage and disposable hosting, suggesting a tactic to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=d+major+scale+piano+notes PDF link annotation
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6eda8dbb820b635db5fb2a5c476c6c8f/97631931206.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfd0adb336---76022026392.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/4f5455ea2de5edeafe8d1944db9549de/zuxurokawugasilo.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58dd00c090---wifuxewibajevevogije.pdfIn PDF document text
    • http://wenxuezj.com/images/File/fagepopawowonizurizomodo.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdfa2a4ddc---biviwazo.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210726013038.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/zadikosesekenozize.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/zupofiximakax.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/1645738112.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f732176d1d---75935697719.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0391971001628955086.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/pgi36iobo5ion81esn061jgjvf/77574256061.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/tizafevibumojujikuwi.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/tejunowatogolonajavafo.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd14d7c990---94335888254.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/etaqfirjkucm3t4sjpuo16uag0/66770944391.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/75551495111.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/bupumijegadatexusisivemum.pdfIn PDF document text
    • http://reflita.lt/uploads/files/62759456321.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ec5dba6d866b6dae0f72be6201f69f42/1849718924.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/noloxisevazekorebut.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/kakitubeto.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA3 16588 bytes
SHA-256: 8def76a77eb7d745e32fd95b244dcfdb40eebcd0899ba7c314ae45a04859bc2e
font_02_sfnt_off000125c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C6 10668 bytes
SHA-256: 7188c632c5a0df0160fb988cddfc0ac9ceb9b5c4be23c777a5317d9d5c345019

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