Malicious PDF — malware analysis report

Static analysis result for SHA-256 8818122a2373b190…

MALICIOUS

PDF

89.3 KB Created: 2021-08-15 04:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c15f0b67d598932ce358f5da296ff49 SHA-1: 805274367ebea19d1a35cb6b3fd4b71ff54dbf14 SHA-256: 8818122a2373b190011049e5a2c3034ec97e438836146386ee88cab91034f4e0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/1ed8e1d01b22891fc16c8a57b8384039/movavijibazorugopap.pdf
    • http://avs-market.ru/admin/ckfinder/userfiles/files/xumudijenikajogudefufop.pdf
    • https://windsbs.biz/files/file/12570933442.pdf
    • https://baxsporthorses.nl/userfiles/file/moferumugevifelemu.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbf960d7ed---42929274712.pdf
    • http://www.schule.havonix.com/ckfinder/userfiles/files/jidupevun.pdf
    • http://systemsbiology.at/uploads/assets/file/24691456344.pdf
    • http://epmresearch.org/userfiles/files/18804101714.pdf
    • http://etcad.net/np/upfile/file/45761345683.pdf
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37545290661.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15019d26e3---rinakonogumop.pdf
    • https://coil.hk/upload/files/77771802295.pdf
    • http://peaceinsrilanka.lk/userfiles/file/nepoxolopasonijara.pdf
    • http://roocenter.ru/upload/file/67588957583.pdf
    • http://llux.vn/uploads/files/papuvex.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/36cf9j3vvahn1stlovod7k0fg4/sanada.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/32f635907b237a28fa2b91ac947cb0f6/vezizumunabipowidulibedu.pdf
    • https://procogs.com/FCKeditor/file/77319783911.pdf
    • http://l-max.ru/userfiles/file/64335868022.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0777e92314---83602769431.pdf
    • http://masan315.net/board/imagefile/file/tavifonozuxefovojo.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/cepojh6qdja4jd5hpm498sgt1c/xeresimajeduwuxosasa.pdf
    • http://canoeing.by/pics/files/43752957875.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tecno+12+18+respuestas+palancas+3
    • 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_off0000f459.bin
7ab09dd14292cba03c823658e7a5269b351bba8ba309c26013bfccfe3388b15e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 19448 bytes
font_01_sfnt_off00012495.bin
d94c201d5249bf6d4e75ab040e7bcb61f446b90ae26f5e3eae53da65de56cda0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12495 10892 bytes
font_02_sfnt_off00013e23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E23 16792 bytes