Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e33c29f89118d2…

MALICIOUS

PDF

73.5 KB Created: 2021-09-15 08:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 36a595a1f127a2156595de63af2ebe62 SHA-1: ea3b59dada124dddf60be1e2e82d192d1ba12026 SHA-256: f2e33c29f89118d23490030b05e4fdc654876f7b175a30095065a3738e2a51d8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and contains numerous URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hanasushichoice.com/uploads/files/45504608912.pdf In PDF document text
    • http://gcsiva.com/files/userfiles/file/19169862864.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/7966886233.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b28ed53f49---naxetijuzujipovoxezezo.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/futimoxaweze.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/fuwevufakawelu.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/fimox.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/70330102974.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/79288825305.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/531dbb997a36b2818f1539ca3b63f98b/nakuvipopuvexolam.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/dusafox.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/pewadesowafukodeb.pdfIn PDF document text
    • http://bushurov.ru/images/files/gepes.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/sadijikibupibifox.pdfIn PDF document text
    • https://dafelia.com/files/vewebitekofox.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/japaxofoma.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/68503812272.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613614d4217c1---koxakonumowuvakaxabili.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-01-20-33-40-bWbzKZHY.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdbb7941c1---43791435289.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139297c2e4---28020542010.pdfIn PDF document text
    • http://chieucoingason.vn/files/sefakumekivofef.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/medazikunosetademi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=watch+hd+movies+online+free+sitesPDF 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_off0000bf06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF06 15812 bytes
SHA-256: 089f0a53ccf89e65c826cc34e5dcf614ddc5bdbd1b35260a8c048b9c9bde3ecc
font_01_sfnt_off0000e75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75F 10800 bytes
SHA-256: 623672fa9226e4c75f0bdfcc64f76b288dbc866bf1602117cbea58f4c76aec88
font_02_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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