Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cfd1371a762a708…

MALICIOUS

PDF

112.9 KB Created: 2021-06-26 02:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f2d69c2bd79e85189ca73fcc94c8f5b2 SHA-1: 2a786fb1eeddce969994b43d07eed2b6ff6a6521 SHA-256: 0cfd1371a762a708ab642a256abbd7096c4390b02f9230ce99accc2ca8bc133a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://zubrcup.by/files/files/nijevazo.pdf In PDF document text
    • http://oreade-breche.fr/userfiles/file/foxakowuzumu.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fdd86b280---watawunaraxidenad.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/fefutejumu.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/12466085667.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/moporugiperunirugoritor.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/27ff915a0bf0aa3cb4fcfc0530aace45/mapibejurawo.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/44659975199.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/vefebadiwotejod.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/mdfqkdec31tkk3coo8c6dqf2u3/79070516093.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d002a1ff---xesenarotiribamex.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/661c7314026381ec7b27b218b7b28f24/42240813924.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/fojexiragebisubufezixa.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bd4820f39---65526902432.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6ebbd45bd6e5ee2d1c094929294736b1/17800444586.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/gopajugefolemusiv.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/galemuzipevozirusonitomo.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/97676791124.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/duguzixexowomojo.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/mudosizikilebonulebekavan.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e535b7d8---18307435578.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce014ab017---zezapebufetobux.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/88266260086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=3+points+are+collinear+ifPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C90 10548 bytes
SHA-256: 839b652720e563e0b6af7d462bd9f5ecfea7c205b408f5c2790c566a64b132d4
font_01_sfnt_off000154b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154B5 19152 bytes
SHA-256: f92691c5c6a08a0ea2b42f54739326c0c288bc65ecbee4b0cbe8bf1c21c52a63
font_02_sfnt_off00018740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18740 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_03_sfnt_off00019c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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