Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f443bbf1ee0c33…

MALICIOUS

PDF

85.5 KB Created: 2021-09-04 06:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98c8ac43c8eb41ca6714341df6826417 SHA-1: 5c9ef5f0c6f690915095194a5014440c7a0b6b08 SHA-256: b4f443bbf1ee0c3341b715ff52229142039fde49c2633acde52c874c798f7107
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The primary purpose appears to be directing users to malicious or phishing websites.

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://irlanc.ru/uplcv?utm_term=lawkim+motors+catalogue+pdf PDF link annotation
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/7901333777.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/kijabinimikubixaguga.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/22359189013.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/pogaduzivonutew.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/48376662155.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents//files/forepasubelosiwo.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/zudetugiloged.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8bd6046f2b400221a7486d46f1752546/75133469884.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/a3449ea3fbbd37ae82f36a2ac20e59c8/lifodorizuselag.pdfIn PDF document text
    • http://teplospectr.ru/images/files/dakas.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f00725540---24722169986.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b23e4aa0f---pujiwimofonukowukakexa.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071e735515df---54655928393.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/pikejenezis.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///sokodomegojojanezaded.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/69431909681.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/49548867669.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/wawedulutodewaderudixa.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608da37d2e951---reroluxiradusanigizafa.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/fafetug.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a75238d3671---59087683042.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/46b5934e1192236547039783e04a96ae/21029271612.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/meganopepedenimak.pdfIn PDF document text
    • http://biomisszio.hu/tmp/92453559971.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_off0000e1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DA 19920 bytes
SHA-256: ba85cc736f7ba56da8ba0cd8153fcf9709c48e51d3c3c094b0c0c41d1588070e
font_01_sfnt_off00011674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11674 11096 bytes
SHA-256: 5fc05030af6d1380fb8de6efb6e2fd311f4e2e751609ff4fd30985897bf3c8d4
font_02_sfnt_off00013048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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