Malicious PDF — malware analysis report

Static analysis result for SHA-256 5140ebd8138d34cc…

MALICIOUS

PDF

88.0 KB Created: 2021-07-31 07:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 161ef1aa1de368e9a361aee02d0557b1 SHA-1: 6101027a417ea4828911384b355526c19f831b92 SHA-256: 5140ebd8138d34cccd5fbc6f1b292c448adc2f84eda801e14a94d5d86b4a6925
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=what+is+interpersonal+attraction+in+psychology PDF link annotation
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/ef4465283b652ed13fe8ee195087a088/zurutexa.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16100f889dacff---kuzenimumixu.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/pesipoxajamazuninot.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/kopeton.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/760eced2d5905a81291a51b0c170271f/getibuxeburef.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/86891254460.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608460eb2cf6f---50765447314.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/92482499673.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/1n4cigpmo0nd70cn6n2rvgtoo2/58647993295.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/3a79d643867b7e9af1c97c75ed2cac51/71537211765.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/31501940289.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/3959690932.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/33734915096.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/bufafagesiserizoni.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/likufibufibijumufatipu.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/89759074067.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/5obaaigtud7om1sqlvgtkeulsk/55362917054.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa902c5b50a.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/55691a56a5da0776c0590f78a0ec0ace/17578303974.pdfIn PDF document text
    • http://primaneighbors.com/userimages/9115750614.pdfIn PDF document text
    • https://andana.us/files/files/70897391639.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/nobafikomupovuro.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/66897761226.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_off0000f44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 10760 bytes
SHA-256: bcfa67ba5d9d88a7e3446ab6bcb09a809ca69d8602b7410f0837afd599ecf93c
font_01_sfnt_off00010d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D08 16772 bytes
SHA-256: 595d4f5eb6448ce5f5dcde46f7de3acad33085ef94d4d9a3da4aaf3c32fff486
font_02_sfnt_off000138ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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