Malicious PDF — malware analysis report

Static analysis result for SHA-256 127055b60b440de5…

MALICIOUS

PDF

89.9 KB Created: 2021-06-27 21:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9dd0bff617155868ec727c4ad9e8e26e SHA-1: 8eb09edca1c5286cb8fee47b4149250e0d38556e SHA-256: 127055b60b440de57a11486eeb58f846dca8fbe3f7e3fd6207193001237eebda
156 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to distribute further malicious content or lead users to phishing pages. The document body is heavily obfuscated and contains no readable text, indicating its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/ee1f91be18a4b0c82d20f38bba7f473a/51772768524.pdf
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/v3shfecpulha76eco8lk68iue1/72803951247.pdf
    • https://2acontractor.it/images/file/mibajetoxenuperawozasiz.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26970afe00---21456911081.pdf
    • http://playeasypiano.com/resources/fck_images/gakutuwedugiluz.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/rvms6dluuohb7mc5oga51567ba/masusebaluzegexode.pdf
    • http://automotiveenergy.cz/userfiles/file/51814319789.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2lbop2asmnq0cpf2vsbs3hruj7/xabemadasosutoranave.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609290df8e007---67577691226.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f15a911ee---36050291011.pdf
    • https://fedico.ca/upload/editor/file/43767899464.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42db7957fd---govuku.pdf
    • http://goteneplast.se/files/images/file/gumeralavanozubalaxo.pdf
    • http://meijialx.com/ckfinder/userfiles/files/gabovufosuxazufubizejife.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bcc9918b1---30902287429.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/64fb5bb1bf05dbd5a58aede940c57435/jolibotalemaziwuzadak.pdf
    • https://himalayanthailand.com/image/upload/File/49082213282.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16096bc6e3f762---55672884075.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/424c7f2a11af1256fc18781d6a0b2e68/gorevir.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072d402b0706---36991542759.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a91d66888fe---38990446291.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e8aac80f8---39258372513.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/f72961b206e53515906dd2e22d4d4a95/wuxuvowom.pdf
    • http://olgapolyakova.com/files/files/66502158141.pdf
    • https://planet-for-events.de/userfiles/file/55974580846.pdf
    • https://harrisitalia.it/uploads/file/87806075960.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=on+a+production+possibilities+curve+diagram+greater+entrepreneurship
    • 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_off0000f96b.bin
0aa55d540ad3d874789e4fc664ad404a89f31d506347d11fef6669b559eda2ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xF96B 17860 bytes
font_01_sfnt_off00012777.bin
aca4efd5d5707d5710124ff412e218fbddd2f45b69aace0d5898813f38daa8f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12777 11292 bytes
font_02_sfnt_off00014169.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14169 16792 bytes