Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb692dd135410187…

MALICIOUS

PDF

85.0 KB Created: 2021-07-13 08:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 52b2e26373a26e46701edd2dcb64a1bf SHA-1: 38dd638b183abdc97cf52a0e56609ffb899d9a20 SHA-256: eb692dd1354101878d7a86b4b38d1cbad0a9510caa1e9e44dd3240a1eeb32a8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=pyruvate+carboxylase+and+biotin PDF link annotation
    • https://windsbs.biz/files/file/pedegubufef.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/0b3c6f925ac9ea9843a590f1b5019b96/femupomarivimikufisoz.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85b1a79621---41380588515.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08612c80d4---samunor.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a27bdff13---57674937880.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/zutotokijinuxaxuni.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/853688914.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/88610526602.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/kukovusa.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16089916a977cd---20910335315.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14f2851cc---90640944507.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a57733be912---88262641629.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/40085141721.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/56538604459.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/jobisigoguzofibefepano.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/25544140316.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c43110ebce8---xegexagekivajir.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/mavinalajafugutex.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/eb3srp6ua672m7hgpdr57tsst3/vesemegizawen.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd4656abd7---joneretujojilemidorag.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/56492753092.pdfIn PDF document text
    • http://ahchala.com/img/file/bevazule.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e85b00e00---gipenid.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_off0000e631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE631 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE48 10884 bytes
SHA-256: f88f1ebb7fd267ea5e3c402955dfe0805126953bba382852d39aab8c317ca081
font_02_sfnt_off000117a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A9 17912 bytes
SHA-256: 50f94a07fbcb4920b227ddb57c7378be1c2d610a79ac0160cbd95bf0c2961402

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