Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb74c41e7a943f3…

MALICIOUS

PDF

78.0 KB Created: 2021-09-11 12:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97e7cc5f14a6ea721a5be2025f428ea6 SHA-1: 13723b5a36fb93499e1d265a037a02aa7fc4efab SHA-256: ccb74c41e7a943f34a49d83da907d68c7a804ffa5c0d6beba66e7720679fbc0d
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nifaelectronics.com/userfiles/file/83376988860.pdf
    • http://goldstecq.com/userfiles/file/zadaz.pdf
    • http://erainbowrealty.com/userfiles/file/86921856230.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358fa89312a---56470553044.pdf
    • http://doggystylzgrooming.com/admin/photos/file/kepaxemebotuzaxe.pdf
    • https://flammerouge.ch/userfiles/files/wurubajibawamuwebaviwer.pdf
    • http://mvpbuilding.com/userfiles/file/mutew.pdf
    • http://sun-green.be/ckfinder/userfiles/files/34662632560.pdf
    • http://lngpetro.com/userfiles/file/26309517094.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161355d42102bf---48687971856.pdf
    • https://ita.kru.ac.th/ckfinder/userfiles/files/rifenebakenulun.pdf
    • http://www.mostenpo.jp/userfiles/files/12243175548.pdf
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/xuzem.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a910deec675932dd3d705b4a20e67017/4876847955.pdf
    • http://wakabaeducation.com/userfiles/file/mavufub.pdf
    • https://korvioinfotech.com/ckfinder/userfiles/files/23050875252.pdf
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/pelugilebinuxaxizu.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9674c530a---83098438429.pdf
    • http://enovosti.info/ckfinder/userfiles/files/59480985309.pdf
    • http://mathrainbow.com/userfiles/file/3120601440.pdf
    • http://s-privod.ru/userfiles/file/mobosewojirerav.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=harry+potter+and+the+philosopher%27s+stone+ps1+iso
    • 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_off0000c6b0.bin
17554f2b6ce583962842e6418b415ee5e49277fd3c12618713499070366f83a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B0 19568 bytes
font_01_sfnt_off0000f9cf.bin
56d053fd223772ba92cabf11ab933d2b3088bcc580089c6795cd1826777fa272		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 10680 bytes
font_02_sfnt_off0001124b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1124B 16792 bytes

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