Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ac9e534b1a360b…

MALICIOUS

PDF

84.6 KB Created: 2021-09-21 14:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d7e5022c08b9520f9e111a14ae004959 SHA-1: 7556f84f08a1694661792446bda23bb2781e1018 SHA-256: 86ac9e534b1a360b6dc7c5c12188aec674f9b7e61334ef733516834c0192be2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The primary function appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.sas.edu.mn/ckfinder/userfiles/files/13323166041.pdf In PDF document text
    • http://bushurov.ru/images/files/37494547964.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/worovivoselagidewifebu.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/35510138191.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/lizogogifegasevinigine.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/mtjk4oj3tdtfut404vq8uv03go/wakawuz.pdfIn PDF document text
    • http://nature-revive.org/files/file/64887912782.pdfIn PDF document text
    • http://devveb.net/userfiles/file/kolodotiradibuvunuzuk.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/42475073603.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/i2c4p31j4hid1jojkk9tjdobmc/97805564325.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/509b76703255427ed6c8f41a437b2127/1277980116.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/66164614047.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/jefonez.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/birozojexajak.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16142026b3a741---tirivuwemolotezozuxup.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/61234414878.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/30322859023.pdfIn PDF document text
    • http://mariancozma.com/_user/file/81249372827.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/69112944292.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/78337382611.pdfIn PDF document text
    • http://ahknchem.com/upload/files/lefizeduzabefafi.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/93527644294.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/sofegigidufogesixalebibu.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/xofijapalupozemasuzupof.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/kumimawobuwenan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=meilleur+application+android+pour+telecharger+musique+youtubePDF 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_off0000e1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C2 11456 bytes
SHA-256: 57d404e7e3766f82dd4db8cd9d57cc69cc79ffc1cab5d15af1b2724295a6d540
font_01_sfnt_off0000fbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 18384 bytes
SHA-256: 713c480bccc1bc37748cb01a21c157372bc157cfc95ffd771caacbd0d97de644
font_02_sfnt_off00012a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1