Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ae733a352d1782…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 00:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9a3e55dc3146c6be9e272a33e1e2712 SHA-1: 414f6a7afb9415368990018282393a63dc069967 SHA-256: d1ae733a352d1782ba95daee5423548d0f2384860a3aebce78f851332e48368b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery, disguised as a job application resume. No scripts were extracted, but the extensive use of compromised hosting for PDF distribution is a significant indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://poetische-malerei.de/web/editor/files/kavupotuzux.pdf In PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/87aebbcd671c0b2cfbabffa30f0a93f7/fufosenubebupefupusenego.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608684ed4843f---besawoluza.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a2a45d8ed---jolunoma.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/sutipojutudefimupuw.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/72671600405.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/zezitigikapawogetunowur.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/41559671719.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/tujilaxo.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/kezezadimupexavajinikugev.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb8dac90a5---67911251161.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/504a34c82145c2cf649e1c3770ef0f8c/75791895479.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/fb6bfe7c4d4b3800b5af70addf394d5e/66989031619.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/34156539214.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/rexuwib.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6ed85e8235906e04e5402716fa705dca/44578251525.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/fikarerimezupiko.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/51369017814.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/73812734303.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d719f24a80d---melodejore.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/94900161025.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612addb3225d9---vanaruveluk.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/eaf11fcd875b66cb8ab50d8ffdb78129/80900527042.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093fb322ddd9---wezevufev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=resume+for+job+application+for+freshers+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3179ef60af2d587567cb58485b1167f4/segafewitopujug.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_off0000e651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE651 18016 bytes
SHA-256: e42d18348c0a565b6f525b3b62ecdb105955a0a3e9c93a62adb5aabcb540a488
font_01_sfnt_off00011478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8F 11300 bytes
SHA-256: 85a521abfe48528112c84a414869bedf577515ec652ce19f85fcbb81a50435e1