Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a3df480a6b149d…

MALICIOUS

PDF

76.2 KB Created: 2021-09-21 05:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 002220a8c58624336ac9529bab11dda4 SHA-1: 8ce95adca917d22c7bb4b228e45f8ed109514f0d SHA-256: c9a3df480a6b149d6d1fbac62539f9b3b0fee0a20a87efbffd100b03196c2532
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or initiating redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thegioidongphuc.net/ckfinder/userfiles/files/tagexotemorovejeledojifi.pdf In PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/pukor.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/95170167156.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/56582378523.pdfIn PDF document text
    • http://ergakiland.ru/files/files/77478371934.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/zebuzubexasituxamo.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/87519955194.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/gugugefitofim.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/bigesegaganimozubabimoru.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/5146319183.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/77662316833.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2529dcf98---pukijopufujanib.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/vopekedituvolekika.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/64082169323.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/77819565042.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/sarusoluwikizizebegaf.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210917221103.pdfIn PDF document text
    • http://ashioke.com/images/library/File/11812033869.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/52185219582.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e261214761---36265302525.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612edf7b587f7---saxadoporu.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/99395948295.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/61134666512.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/magonalinanuzikuvusul.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/25521321102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=get+lat+long+of+current+location+androidPDF 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_off0000c5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E4 10624 bytes
SHA-256: dd286326ed5d326e23ad546a19b3dfc346649a82e1f044438c250a6b42e35ccf
font_01_sfnt_off0000de18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE18 17160 bytes
SHA-256: 4c1a0e25402af3425168ea98c2b5b5bf72f6cdf34751e7f577d410098cca2f9e
font_02_sfnt_off00010aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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