Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8a56746def0c70…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 12:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 546309a6fe99e6f0c0980036c18f890c SHA-1: b503e0e1956079d6cea09cbb8125c9af4374a780 SHA-256: 3c8a56746def0c70594715951ddd41099bef1fed149754b2501dc3b0f1e14af7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan.

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 https://liantoong.com/archive/upload/files/pijugimelog.pdf In PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff5c476f82---98467351548.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/pemewifinodopa.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/9249437985.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a299a8c7e9f11a837ac4fc05c10dafd7/13230801138.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/guwuj.pdfIn PDF document text
    • https://blokhol.com/upload/files/80346701017.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/73864350393.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-9/20210909144941143797.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/9435330603.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/zoruzabe.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/dujojotapipisemifixemegop.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/jugipiwaxumanibugumez.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/19120010179.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/sapajafa.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/48462149095.pdfIn PDF document text
    • https://simorgh.it/uploads/file/24880585184.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/87804175831.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161410d8a00f84---pipalajitajuvi.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/wonusewisi.pdfIn PDF document text
    • http://pactolous.hu/upload/file/zenerovenixarut.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/niluranexev.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/31866662485.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613b372e8fbcc---66656870339.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/memekumaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mortal+kombat+hack+versionPDF 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_off0000e09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B3 10788 bytes
SHA-256: 82acf40d86aa6c82d7d9307b59d538ae6cd060c23ca52801cc9c4b655b652388
font_02_sfnt_off00011166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11166 17248 bytes
SHA-256: e666f92f76c41ad510f37dee480ab553200da25a1583e9d85625c177c15d3cdc

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