Malicious PDF — malware analysis report

Static analysis result for SHA-256 3659e446b1af0d22…

MALICIOUS

PDF

83.6 KB Created: 2021-09-12 12:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0491e72600ce4f3308932999993001a5 SHA-1: fc0cd647b6fc2368206cb38e8910398a0d587fa8 SHA-256: 3659e446b1af0d22b66241bd6ba25a5f152ba9756b468201f5485f490e462dde
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs, many pointing to compromised CMS upload directories or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or malware distribution, rather than delivering content within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.premiumtrade.ro/ckfinder/userfiles/files/15322563202.pdf In PDF document text
    • http://cga82.com/admin/File/tazifawo.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/61052124541.pdfIn PDF document text
    • https://grandegroup.net/files/ximugorakabas.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed3f756a12---regok.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/94400691962.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc1d945o1t5rnu3bubm8o1e2jv/34003680335.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d14a10b175---vosamamibofusukuwe.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/rogaluter.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/dekuxisozedi.pdfIn PDF document text
    • https://hoongnau.com/upload/files/28706020457.pdfIn PDF document text
    • https://harmony.im/userfiles/file/gezakirufol.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210903123556.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210906001930.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161363c46c55b3---79258829480.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/03242d553d0ba6c636d284e93e7d53a0/jojewurupegalidifimu.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/wekebajuwogelasonagomiwo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/73957473337.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/95553757156.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/fetisadonazux.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/58494191735.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/xeviduseguximuvafon.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/69988037819.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/sepodutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=iptv+smarters+link+for+firestickPDF 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_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 18852 bytes
SHA-256: d90172d6be4a2d5782a759e91486adf8c34bfb53e4ad6851f6818ca9a23d1526
font_01_sfnt_off00010fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BA 10752 bytes
SHA-256: 2b792a9a7e92ad75cd49cb97af0475c92ed1187b835f33bf4b54da7b3470f70e

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