Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be95c47d6f61788…

MALICIOUS

PDF

84.2 KB Created: 2021-08-03 05:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2371884305b9dbac05c1867eb02ae03 SHA-1: 2f069fd27dcf863f6de65b9df76b757c043d6ed5 SHA-256: 0be95c47d6f61788438bec0350a94cf4f6b12347feeeda6e62f546926123362a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://queure.ru/uplcv?utm_term=how+to+silence+a+kidde+smoke+alarm
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab18501de6f---rezunakomugevalezanibit.pdf
    • https://infiniteprospects.com/FCKeditor/file/xagesodigito.pdf
    • https://newsru.md/upload/userfiles/files/dabejasusibevamenigozufel.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608174a02ef2a---lililapaju.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/asgg9vd7rasqnaer9fqg5prhh1/36420221587.pdf
    • http://thermogroup.ru/uploads/files/xoporep.pdf
    • http://ya-ke.cn/admin/upload/47513338151.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ca9e34df595962837c859eed611e13eb/94852244361.pdf
    • https://hosvagyok.hu/userfiles/file/35733388780.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e20886e57---kowulowomes.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160891b73661d8---gukudadobi.pdf
    • http://sns.hu/_user/file/52942221340.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160820d8b879d4---32092182520.pdf
    • http://kinocosmik.ru/sadm_files/77623227579.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a636db8630e---52812057109.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5ef6ae137---42033513308.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/fdd4587e921f3f10234f540a866a2676/54971900621.pdf
    • http://cck-brno.cz/ckfinder/userfiles/files/57883659681.pdf
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/duxitunosemebenuloki.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/9937e22d991416e111ad1ab692f5c695/xiwameluvamigugidapa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e431.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE431 16792 bytes
font_01_sfnt_off0000fc43.bin
b5475fa8ecb483d0fd6751c56c8dbfe0a631b0bfe764c53ed92e20b764b842a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 17304 bytes
font_02_sfnt_off0001293a.bin
e1232bfd987a189ee1f6148f383c46e077c475d5484680e27dfcd0a269f07a0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1293A 10700 bytes