Malicious PDF — malware analysis report

Static analysis result for SHA-256 d910ea17de91a8d2…

MALICIOUS

PDF

73.9 KB Created: 2021-09-04 16:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e07d96665d9128e8d5f69b7d2db0355c SHA-1: bbe3e644bb7f9d287cffc46d3ae3a20ca24bcb56 SHA-256: d910ea17de91a8d20507c4c7af4e86d9884e2eb14760312b76825befe36d5c1f
156 Risk Score

Malware Insights

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

This PDF file has been identified as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or contains malicious content. The document functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised CMS platforms, suggesting a phishing or credential harvesting attempt. No scripts were extracted from this sample, but the presence of multiple external links and the nature of the heuristics point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hgb.se/filer/file/vafalakerovalagirokedep.pdf In PDF document text
    • https://whatshoulditcostme.com/userfiles/file/72488372064.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/xuwelobixiwonesizemibo.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/kazuxenituk.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/a214266c35d99d29f7e3c13171685199/biragefikamofugajumamaj.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/3390785016.pdfIn PDF document text
    • http://tms-operation.com/upload/files/pelavupupifukariz.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/21bocdn42s6u1evblvrok6dc76/17373877655.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ad95ceab7---18203135982.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/zidijabukomi.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c78ba39df4f---66321612928.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/fumut.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/fitaxofalof.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/jiradepet.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/13273281720.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/vamarivepawapeb.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/47007510496.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/81286ef98326d6a7c28a0bb0db4d1b85/perufenobefasuzepasike.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/tavosu.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b278f821ba---tilotapiniviwexiv.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210807040307.pdfIn PDF document text
    • http://thongthien.vn/upload/files/suzuxagufesuj.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/3e04827b0e6d2194b10f1c204b0e6a89/22755223946.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f524cb7d636---xadepoxexiz.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876e7329416---rodazukonigomabigominafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=maths+terminology+in+telugu+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_off0000b930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD142 17772 bytes
SHA-256: 8a2a12b79e2ce3a001670a5c3b0c08480655230303708f6b58623d57018b98c7
font_02_sfnt_off0000ffb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 11152 bytes
SHA-256: 79216ed641dfdf4d1ee6df6d0f0a5dc3e4078393066122205e9ab48c454724b7

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