Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4a86ae41307b0c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 11:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4a46a2e41f54bbace456a4682893a163 SHA-1: 77059d8d51721f15827990b483b77cec93de0206 SHA-256: 3c4a86ae41307b0ca694d02e61481901b5f451c922dbedec88725017423aa3c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608413feed27d---kiwirafetupukifedu.pdf In PDF document text
    • http://randalljroutson.com/clients/44711/File/vaxozilimepewofinizakosa.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/pelawul.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/xegakolebenonusinuzeba.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/33941886475.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/bd8d8e4768c02ee291f2a5cf877ab8ac/sexivukodudarukebawip.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/davotutexix.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f1a4829ff---fedoga.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/zekosotenexafufamip.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612999eb9ca53---maxudafaregifusexo.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/jumesikukiw.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/61c943a1326fd635320f65e450b00692/25217582261.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/48222119017.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/50093893126.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/6595602199.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/905fbae9d773d5f865e4e44f3fc2923d/jezimepabig.pdfIn PDF document text
    • https://retta-bg.com/userfiles/junajixanalokorikudaduku.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/7d9c1082545e49a40e46699e8b50f690/48069763791.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/zunomobadatifunatedefex.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/10aea01803f240e9c3cb7a5522805965/93742857916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=firex+smoke+alarm+fadc+4618+manualPDF 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_off0000d9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A9 11316 bytes
SHA-256: 96a287072dcd5428ec075998bab702673e1621a3379e33404f1a1116fabf58a7
font_01_sfnt_off0000f44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44F 17304 bytes
SHA-256: b83a6e4df6a2237dffb70e07a8d53ad39863b0a9fcf4c5e4ebfef336c50eef75
font_02_sfnt_off00012135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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