Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad79f887741f5da7…

MALICIOUS

PDF

70.3 KB Created: 2021-09-12 17:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e1ac60b7e1ece44335c099a9c4b763a SHA-1: fd6c4461b5a449dee7e30a237c60385a91cd47ce SHA-256: ad79f887741f5da7d43851910b7f6f8c4f08fbf119b5e8e3a93eb187430a6673
154 Risk Score

Malware Insights

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

The PDF file contains a link farm, with numerous URLs pointing to potentially compromised websites. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious. The primary purpose appears to be redirecting users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9156

Heuristics 5

  • 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
  • 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://costabravas.com/uploads/localidades/files/zesinesironabut.pdf In PDF document text
    • http://hublihorse.com/uploads/userfiles/files/zovuwokedujubov.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/gavesagobe.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/14030540551.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/jukakisuva.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210908_035544.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/43271335844.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/ripivekilobimiresorojixi.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/wizexuvewawezozorosese.pdfIn PDF document text
    • http://santehnika34.ru/images/file/xesilokogijasosemutet.pdfIn PDF document text
    • http://nova-auto.com/upload/74352166455.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/kugulisosurodoboxegeduv.pdfIn PDF document text
    • https://glozor.com/userfiles/file/48307064670.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/39750178124.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/98391045392.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/dv7lq92lbqcojnl4robi8jjp32/92892576592.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/ede9c806eba57c2bb2c71330efa13dd7/50904018049.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd000eaa69---87661711378.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/karapesenurudewufegi.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/5806409829.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/gagufivejalagedatibaje.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/visisiriri.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/nopijukewurufawe.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/doladujupafibadeleperow.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/98582807100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=drain+fafnir+beyblade+qr+codePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF142 10604 bytes
SHA-256: 512402b1395a10b3340f861566c1eeec059b635f16e2e5e430ece4c90a13220d

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