Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b9f2b573fee003…

MALICIOUS

PDF

88.0 KB Created: 2021-08-05 02:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9bd570a8828e5db565631c357bc377d2 SHA-1: ca21abd6eced44ed4958578ee31fcea65741bc5d SHA-256: 20b9f2b573fee00351e277afed67409bb1ea640805466e62c55eba58ba09ed11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, some of which host further PDF files. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious content or potentially for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://garglob.ru/uplcv?utm_term=what+does+charged+off+as+bad+debt+dispute+resolved+reported+by+grantor+mean
    • https://villamishkan.com/310renonew/front/images/files/18466123181.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vklq33mbe5fvh6a2b8uil5qkd2/14613729324.pdf
    • http://harryreichert.de/uploaded_pics/News/file/wokided.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085aa958c70e---42095877027.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4f630493d---64901900606.pdf
    • http://stellarp.com/userfiles/files/49735096387.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a866f985a7b---sogemumugaxesosiv.pdf
    • https://planet-for-events.de/userfiles/file/14187360491.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c638b69f---12608517562.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9a9afc485d5e7de7f15356035cf83a0b/96635280876.pdf
    • http://firanywiktoria.pl/uploads/editor/file/16639646574.pdf
    • https://bikeid.net/ckfinder/userfiles/files/kinapapikugu.pdf
    • https://garraldaarquitectura.com/garralda_userfiles/files/bagafulizopibepu.pdf
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/bukezalitukip.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4d672cc4c---mopijabara.pdf
    • https://manajrgvaaradhi.com/cms-uploads/files/61975529953.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078df5363b76---wuganolaxoporotizipo.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/qd78fcpkelgqru22ev9r26l1r0/bomew.pdf
    • https://bepxuyenviet.com/upload/files/mimususotonezasabiruma.pdf
    • http://marasintl.com/public/ckfinderuploads/files/81196287919.pdf
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/bupeginixagogebo.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/801f7104dab52076e4d55f59e54c4b4b/75118579276.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_off0000ef31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF31 16792 bytes
font_01_sfnt_off00010743.bin
02dd255c488ffacfbf1e53bfd256f60b8d22ae67d78cf1f581d7482f8d0f9f7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 17220 bytes
font_02_sfnt_off000134ae.bin
ecc995efd32a7b69a90363df736187798a8ded981e0ac87ecd7f7938ff8d47dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x134AE 11480 bytes