Malicious PDF — malware analysis report

Static analysis result for SHA-256 5487a3a841f269f1…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 18:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dc1efc04e6bd8b4186005fbe00e72147 SHA-1: 8ba0e34dbf682e62bfcafe32ecb469e3e6f6dd31 SHA-256: 5487a3a841f269f1ce6a73ed11ebba7ebbbcc049906e1064410cf503a1eb70cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://synerhu.ru/uplcv?utm_term=rotura+de+ligamento+rotuliano+pdf PDF link annotation
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/fugowojugelefejonadakanil.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f43e584619---1212742454.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a695a1f3aa6---reresiban.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/11d29bce8a1e139dc2c6539b488b70bc/pifufu.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202108170312556750.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/9eqvqlfhd7olp8b17i5tl33oc6/zidilupubazexitifigux.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d96c6930a6---4463999502.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3cdf50363---xapulajowoluvafejaxufozib.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///fugajazuwetigokibog.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/20048983902.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/jasebowixupin.pdfIn PDF document text
    • http://ausafe.net/images/art/files/13060718997.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/widile.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/lewimowofatibo.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/pivagux.pdfIn PDF document text
    • http://spakimthi.com/upload/files/novenesafisopirupetug.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/sebugeritazimifivazem.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/nifenivorebid.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da05f6148a---45810552946.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/37151731954.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/68808536333.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/uh2g66u9scigig35t11aep79ie/75245781154.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/19469746203.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_off0000dcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDB 18516 bytes
SHA-256: c034bba96e67fb27eeed7e5007a626fe4a0758ed2e3512b7187ab3c041de0068
font_01_sfnt_off00010ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA5 10816 bytes
SHA-256: 11ed631df12ff42f303a03facaeeb7ed04c463725003c5bf90251c3f6e2f5d16
font_02_sfnt_off00012453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12453 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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