Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c408350f4487e90…

MALICIOUS

PDF

102.2 KB Created: 2021-09-04 05:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 40fef966847bc57d3d4415908e5a1e9d SHA-1: 97693f18a91a3c9844abc51a277b1f3e9e55c499 SHA-256: 1c408350f4487e90017c0b1c9feca6ab1a526ec4d5d6a8e1c7a2aeaddd0e8bab
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://a-swiss.com/upload/userfiles/file/13875867215.pdf In PDF document text
    • http://otohondamientay.com/upload/files/benososulekikuloko.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/sogikugojizetela.pdfIn PDF document text
    • http://www.heksan.com.pl/file/73258370522.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/93389372531.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/42587204686.pdfIn PDF document text
    • https://negaratoto.com/contents/files/98510736324.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/eiqc5oplnb62bjsekgvkp8jcpd/dogenutuwil.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/c5d71588428c39a4a029a829bf943220/4629081105.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af4aae1a0e---rodot.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d6bbbf522---nivitevi.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/xutit.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807c2e83511---sorulu.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/56530771963.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106da91b30e0---gibir.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/xuxizat.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/78522248726.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/81428683510.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/lonozumebonikamebiritunes.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/48833109218.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/n7i665oevvjrj99g249v2cljda/zesojirulorupogukilexakod.pdfIn PDF document text
    • http://metallpress.ru/files/raletewiduwixati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ferroelectric+polymers+chemistry+physics+and+applications+pdfPDF 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_off000126a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBA 19536 bytes
SHA-256: a61e3768c426ca06e7200814abd8aaf662d52d64b0175fb197ffdf118eb4fcee
font_02_sfnt_off00017138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17138 10976 bytes
SHA-256: 3fe7dfa3808adafd84c466d8d6325c9b8d1a98f07bba43367eead72472173d9e

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