Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9e81b2461bb64c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 02:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8857078e82fe6321e5dbc21be7dd4bb2 SHA-1: f36d3a08b444c4fec70fb1c63bef940c79df9cf4 SHA-256: 3e9e81b2461bb64cce1db0e7865b60fff74170b6e14a1746e680c8d0b56e88b5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

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://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/s1p1mkh69e628qbi020eh42lbl/19705488907.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c53445b36b9---sodajunomolivefumesifis.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/zamusuledu.pdfIn PDF document text
    • http://ozari-ua.com/files/file/tirefarobowajud.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f72c875c51---54386564564.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f58787b754c---24409293978.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/89455854296.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/74270018639.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/917b6e6de87f7e8cf06eba2fe426a700/76970117704.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8470b3544---kadiworarezonapimawinebe.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/xataridovabunenilufuvozo.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/balem.pdfIn PDF document text
    • http://sieuthibds.net/images/files/41445379331.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c95a7245d4aaff274e4bd1c6b0fdf5ae/95847311517.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/mubafedojarujepivokaxuvad.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/bawinokekumeko.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607144870022e---wexilisuzegiruxovix.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758c0a34aec---sidulubawijux.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/19782365108.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/gubutodijun.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/35289969005.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/56789401681.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d8fd92e2f85decd5a5f694501fd565c0/61680490318.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/37698271138.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/dusumopemesenetener.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=periodic+table+without+colorPDF 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_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 10524 bytes
SHA-256: f2f7af1a97cbef48aeb04017b4f069626652054570e21f50b48a7b653b2da5e6
font_01_sfnt_off0000f2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 17312 bytes
SHA-256: 432213255f513d9361894085dc51b5d4be8f0bdcc6143067a6dc2ae3dd2c36bc
font_02_sfnt_off00011f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1