Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8c82deb20d3595…

MALICIOUS

PDF

86.2 KB Created: 2021-09-16 19:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ee72c92e58223635206ceeb19001a278 SHA-1: 0cbc1acbc5725c177f2788c30d8a042dd6219f0e SHA-256: 2d8c82deb20d359500136a01680a9298e6162b22c507596de3fe0874a1c405e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=adjective+words+starts+with+a PDF link annotation
    • http://henskeschildersbedrijf.nl/upload/jezezegigo.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/083f02cc07913d3267b05510d69dd5af/midedapuxob.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/lutuge.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/novonawegam.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/79417850016.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/26774925013.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/sexafixegopoje.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hqpr486nh8crm9rqes8163jqg6/sufarupemu.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/90669543553.pdfIn PDF document text
    • https://cristalensi.com/public/File/maturo.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/lafigimoferofevux.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109152129226199.pdfIn PDF document text
    • https://nasikampung.info/contents/files/35860813661.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16137e44907200---57111695196.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/rosat.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/46981272596.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613736b483204---furebolobiwisozufexol.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/90354086247.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/50550025572.pdfIn PDF document text
    • http://tcihk.com/userfiles/14987433420.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/loviparopi.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/30988278647.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/32181436095.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_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 10580 bytes
SHA-256: b0a9efee333b99e149a11c94ff7e185355c1d7b34124d0349785d2382502cfbb
font_01_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9D 16876 bytes
SHA-256: d20b76ba1542114e29854880aab986ca40bb54f133d0bc8e1fefd98737febf43