Malicious PDF — malware analysis report

Static analysis result for SHA-256 89af2293e3828752…

MALICIOUS

PDF

77.0 KB Created: 2021-09-17 06:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e452ebb2be77692dc12ebbfff39b615 SHA-1: 286c8277dab42955fdf00a3c9266f88e85568b2f SHA-256: 89af2293e3828752d2f55404fdf0f6d438a529f4bd8d13cb1334b3aef8673b9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://inwebjor.ru/uplcv?utm_term=how+to+make+money+in+roblox+adopt+me
    • https://camelcarpet.org/d/files/39188849540.pdf
    • http://uniondrygoods.com/fckeditor/userfiles/file/84449686226.pdf
    • http://kstarsmall.net/userfiles/file///gasilixujak.pdf
    • http://sunpix.ru/img/lib/file/62797728832.pdf
    • http://biancoacolori.it/userfiles/files/tizelovajepamijubipebiput.pdf
    • https://culturasiapamplona.com/guiarte_userfiles/files/balegosupel.pdf
    • http://stellarvvv.ru/ckfinder/userfiles/files/wejusilusejegusisirufo.pdf
    • http://luxlustry.ru/img/upload/50749721928.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613547f44f90c---84906543557.pdf
    • http://torby.kbo.pl/ckfinder/userfiles/files/87473599431.pdf
    • https://padservhosting.com/userfiles/file/51558615012.pdf
    • http://www.miyadenthai.com/image/upload/File/ralaki.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130c0b53eb12---72704534667.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420e7f4b0cb---robeburozores.pdf
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/kiwikipedume.pdf
    • http://lenosada.sk/editor_uploads/files/tazivodaw.pdf
    • http://chafewyuok.handysociality.com/upload/files/zitinazatedabuxodu.pdf
    • https://grafconsulting.pl/Upload/file/61882425869.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e401380b29---fawufugonitidev.pdf
    • https://nsaimmigration.com/userfiles/file/47351025674.pdf
    • http://atrsara.ir/resource/files/31353084839.pdf
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210909131827.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/tsd6j6o79ts3bbj5uua6vc3e55/sonuvu.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_off0000cb3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3C 16792 bytes
font_01_sfnt_off0000e353.bin
b3e4f8b70ea4335251516491729dd73ecbc571b81c5b0aeb94b09f35c4c94789
pdf-font-stream PDF embedded font (sfnt) at offset 0xE353 10908 bytes
font_02_sfnt_off0000fc4d.bin
252b26c4e26cbfcd0bb6bf87ba125909a7013e171ae419a1e5abf402ee638559
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4D 16428 bytes