Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c4e3275a72522f…

MALICIOUS

PDF

75.8 KB Created: 2021-09-18 02:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f7fd1678f31b432e4aee61a199f302f8 SHA-1: 7846e42ccaed3386dcf8c374134cc589730a2701 SHA-256: 82c4e3275a72522f53172b2585d11d47694f52c253e2af1615304eb7a2ef5e92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristics indicate an attempt to lure users into downloading further malicious payloads or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.mustwalge.ee/data/content/files/30483831229.pdf In PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/jogazujozili.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613244602fe04---nazojomot.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16145223fb6be6---takid.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/19588520259.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142821931df9---sazirumakinezapukibowumi.pdfIn PDF document text
    • http://gro-felix.si/uploads/65272153123.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/84020803047.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/69174735786.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/84760137120.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/58876388408.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210903163064609619.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/nubogekepusakuxure.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/11396029366.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/63671771227.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/busetebo.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/11911146718.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161451abdabd61---nesakex.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6429359c4---68035434204.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/popuzo.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/ruvinubotexavago.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/36255413187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=total+money+makeover+pdf+free+downloadPDF link annotation
    • 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_off0000c796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC796 10720 bytes
SHA-256: 94889300e278d087ddc8e573390cdc5c1fd9b9fec6abf7c10419cbf513a37210
font_01_sfnt_off0000e048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE048 16260 bytes
SHA-256: f9f3ff5890da17fd0b7211eef742be861edd58d68aa83e618a768662fcb7ff48
font_02_sfnt_off000109f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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