Malicious PDF — malware analysis report

Static analysis result for SHA-256 9488ef53bbe3970b…

MALICIOUS

PDF

86.8 KB Created: 2021-07-01 15:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7594319bc64740cc2bfedbbe5eb300a4 SHA-1: 7b5122ee05ebecd37bf7e6e54443ec53109c11f3 SHA-256: 9488ef53bbe3970bbeb005275604955dfd1377d8f1da3c8b34ad86ad1e94d42e
156 Risk Score

Malware Insights

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

This PDF file functions as a link farm, directing users to numerous compromised websites. The presence of multiple PDF link farm heuristics and a high ML classifier score indicate a strong likelihood of malicious intent. The ClamAV detection further confirms its classification as malware, likely a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24329224ad---kuvotigox.pdf In PDF document text
    • https://alatheir.com/atheirwsfiles/file/nonujisujar.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/044d8779fa4b44305f5978581e17669c/86784861318.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6ikj050ua278099t1obif10vo5/51344804644.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/02038bf10cf53d56e042466c4cd90748/ririgimos.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a49dd155897c7d288b2b21f4fc56df60/dumodizewiforid.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3784a25739---bekiga.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/de04e049a4a9c5282a93ade94f93256f/gedileduxow.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/b97sflvh5h9vakbbk435vlepn6/jatofamusafogusepileje.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58ea63cf3f---lomamuxenexizabigepabimad.pdfIn PDF document text
    • http://planetamama.ru/files/file/jivonijirup.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/res6k1od9dshl40ihm95nesii1/tapevokefumosegafati.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/7592939064.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/55392944463.pdfIn PDF document text
    • https://totounited.com/contents//files/67054717136.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608923574147f---60107096235.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160879afc4e991---54689251878.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/50447030938.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/zawonowovovubo.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/25b2a09c9d15269ec3e3ea8403db220e/lenidenurusebudodezomaz.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/rotuleviputilugevuk.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/mawodo.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/d6fd5c5a60e24fccc57e5419057ef700/83766925945.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/u9masdsfit8tdkf9stivls2ldh/kojegozokamim.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608094f81a448---tudazajisukamis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=full+grown+electric+yellow+cichlidPDF 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_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 10596 bytes
SHA-256: 7dfe58e8a6db9764545f8ebdbd0ce947d84367178dbb183b9629baa59432c53c
font_01_sfnt_off0001082d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082D 17376 bytes
SHA-256: 7cc5d41948cdd0dd174e5f0c3057ccb920e3a07730554c2c53d72f23301805df
font_02_sfnt_off000135d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1