Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d06c2e980abf39…

MALICIOUS

PDF

85.4 KB Created: 2021-08-06 03:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bee3548a9e90fd075fff514e5154cbc3 SHA-1: dc333933d38253a20899e03444a193a4cc2b15dc SHA-256: a2d06c2e980abf39286525a94628162de07ec78b1a42c448362bb1b2150689b6
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to manipulate search engine rankings or distribute malicious content through a network of seemingly unrelated sites.

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://bustotoronto.com/userfiles/file/zanolotimalaketamupig.pdf In PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/talomijazi.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/venizixuxufot.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/5776584bf4b8704ec47d5a9a3d7d331d/melosamitujoveguremapuf.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/wufanatipemokivilazaladof.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5341ed6ff---pexemo.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/gt9f24gcui8ud2l25sl5nrbmff/ninazexaxikovanegabaku.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/9cjigqh03tjgi4hg4peggo1ql5/logubu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af888e145c7---19616883445.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075e3f3d0806---97518506622.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/jepokutaguze.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897a9eb818a---wufaxulolesurom.pdfIn PDF document text
    • https://polandpools.com/contents//files/newisolonevoluku.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/6a0cf30bea7bd5384751dbc3b567bead/82330362520.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/91370311624.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/r8vh1vji6eic5cad85ct8gesi4/jetezewujesusiw.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/97604500307.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021062805234821.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/pudpdb532kv6vuopc0hgmheqh9/34254343377.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/934ba482db4367e4e94342fd28332c4d/72857991817.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/80170279893.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a00da9d4f30---jurixe.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/b6359d42dc46f1a0754b58025d488dd3/71389468205.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/15363c50655011ef267bb25fe8474c0c/63819617940.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/77430999448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=32.1+the+skeletal+system+answer+keyPDF 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_off0000eb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB64 10768 bytes
SHA-256: d87807bc0e4dec6c8eacbede42557a8db181cc454ec5a0b3e9837e3dc608e389
font_01_sfnt_off00010427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 16692 bytes
SHA-256: dbb24c237aeb2ca1931d4e5d2bbacbeca31144f29b794301dfddf7fc8b0a24ec
font_02_sfnt_off00012f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1