Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a2e5e8b89ddd73…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 19:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5785d4d74126c8b2ce7046bd37a59169 SHA-1: 36d36e5b838eb2d7d9a2e5961daf2fdaef22d761 SHA-256: e5a2e5e8b89ddd73dcac9fb67df37d51cab50d9654f9d40510a42b8d50d528e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=how+much+ram+is+my+phone+using PDF link annotation
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161387b94c5a9f---27231433840.pdfIn PDF document text
    • http://zubrcup.by/files/files/35877826307.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/45034933368.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210919213739.pdfIn PDF document text
    • https://andrejc.si/files/file/73865852104.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/71387443665.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/14134247937.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/jupopedofubav.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/kizegufipetejuv.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/56841939695.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/98792047450.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/43037159689.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/20510593610.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/49263405589.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387eebacc58---terupinox.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/mazevuvafu.pdfIn PDF document text
    • http://pk.mo/userfiles/file/gikibifubabojelozid.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/posiwoli.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b22cd6ea7d---95268115393.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/46504958894.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/2255548381.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/pakenu.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/50460473973.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/4736625631.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_off0000d988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 17300 bytes
SHA-256: c15c5a7ed12f03c9e70789c38f0498d2d91ba16be2984a3c2a83dfe4d4eea65c
font_02_sfnt_off00011e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E56 10968 bytes
SHA-256: 962843dbf3e82b19052d5aca33594160579c507cac8a1ce1b8711d576c268e72