Malicious PDF — malware analysis report

Static analysis result for SHA-256 c666d63ad480b0ab…

MALICIOUS

PDF

88.5 KB Created: 2021-08-09 21:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfedcad4b33d77c2de6ec98a5e38b006 SHA-1: 75a64818a2f20745869cd793037125926b56c495 SHA-256: c666d63ad480b0ab23d1d02e3e713350c9dd0e3ed84c26bb0ea20329af5d03a7
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://abimobiliare.pl/pliki/File/6800365951.pdf
    • http://allaboutdowney.com/userimages/36701206624.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16082bceecbb7c---bulafizadile.pdf
    • http://deltastal.ru/userfiles/file/6011637244.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/9ofp99ti28gcniq0unem5bdi9o/87733093073.pdf
    • http://studiogaleazzo.eu/userfiles/files/22030319844.pdf
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/68036213577.pdf
    • https://samavetah.com/ckfinder/userfiles/files/5233193849.pdf
    • http://pcserviszlin.cz/ckfinder/userfiles/files/kunorimotopaf.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0b5110be---93505891942.pdf
    • http://hornets88.com/clients/56662/File/totizem.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/103aa0537b7cb77353f1f8692a388ac8/96666932799.pdf
    • http://www.serge-valentin.net/ckfinder/userfiles/files/loxuxojepeso.pdf
    • https://aspaeng.com/files/image/files/jolavig.pdf
    • https://alshuka.ps/ckfinder/userfiles/files/24152903557.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e6e5a0409d2923f6518333881fea4ddd/vojuxiwevijujifagakade.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/35264375873.pdf
    • http://thermcom.cz/userfiles/file/lunalenitipaxavezaji.pdf
    • http://cbwmd.com/uploads/Files/34231219682.pdf
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/muvekevexewode.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a7fd695c7---vamozataxamiposunalabetej.pdf
    • https://ivanamihic.com//files/morune.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7df7bc428---78937322013.pdf
    • https://jager-ig.tw/up_photo/file/bajiwurarukuxodeni.pdf
    • http://alexlunacoach.com/img/editor/file/xolaworu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=rationalization+policy+2020+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d14c.bin
5786afe57e8db72ca734a29d867e430b8fcac53ef5cecce51800014ae7b194f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD14C 10672 bytes
font_01_sfnt_off0000e9fb.bin
2feac89928d2fa9249061028418e2a96c270909ac5bd052a8bb112764687a3db
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FB 23124 bytes
font_02_sfnt_off0001110b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1110B 16792 bytes
font_03_sfnt_off0001291d.bin
037393145f1c9b844534e8446dfc8402a2165afc11ee01d9dc58becfbebdbdb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1291D 16492 bytes