Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc7178e6f04da4d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 20:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a5395b92f85d49630eafb7b28a220fdf SHA-1: eced72bec987f0dabb2c783a9bfc0d0ab0c13b07 SHA-256: cdc7178e6f04da4d42863f54e4415d0ca7ec8b29db4bb5a81ded487467949f5b
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the high ML score indicate a malicious intent, likely for SEO manipulation or to distribute further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://uleshuzatshop.hu/files/file/40635271004.pdf In PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vutama.pdfIn PDF document text
    • http://orlickachata.cz/files/files/lumowurogupur.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758d9059295---13803925248.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/94857975821.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/fusisidevopuwixa.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/gedisapofuvewuvawevobagut.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/10514059746.pdfIn PDF document text
    • https://angkagenap.com/contents//files/laxigibamugeranupopovewe.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/68416790517.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/44250467263.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d7fcd2db---tukowefuzaxobuwadezud.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/zifabutonabukelufiju.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/mubelodiseb.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcea88d6cee---woxofejorazisofuwunoku.pdfIn PDF document text
    • http://kd-council.com/upfile/files/6744215727.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/padesilazawudipaf.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/80676031362.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/wufedovexelevebi.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/77944269613.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/lopezusane.pdfIn PDF document text
    • http://aven.su/userfiles/file/gerogidovodelutaji.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/18688618370.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/94483850713.pdfIn PDF document text
    • https://maisonforville.be/documents/file/jokekek.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/mevudak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+measure+of+central+tendency+for+agePDF 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_off0000df75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF75 18484 bytes
SHA-256: 234df2271aaf03787e24b977ccfb49ffa95ec63bb1cc3735e58c70b28d5dfde0
font_01_sfnt_off00010fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE5 10996 bytes
SHA-256: c617b1db16be5f116d0c249966aafe8c712ef03076bd8f71cf419340df011f7d
font_02_sfnt_off00012951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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