Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e826343680eca8…

MALICIOUS

PDF

90.9 KB Created: 2021-06-30 02:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e9970d778bb1921ecb2816650f96233 SHA-1: 9f846530a46a900c486607afc4c487ad496fadf0 SHA-256: 23e826343680eca88f54fe38aae17d7ee508782d110536684bb202305c15a96d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://detectiveoffice.net/userfiles/file/jajusubizudevaxowarig.pdf
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/14013215850.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/kopobedugukesuw.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f297d0808---45024746530.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0d4ab9053---60939663207.pdf
    • http://bycongroup.com/UserFiles/file/rufavizezevo.pdf
    • https://camgloberealtor.com/userfiles/file/fosukaf.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/e23d40c5c0f24117c88871706fc21345/97115674680.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/86b6f1b80e5624fa8cbd527cb06808d7/73433797152.pdf
    • https://agrilaui.com/userfiles/file/36209954796.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/afb340d2fadbae8d7a857b6e63237cad/tivigagufenux.pdf
    • http://aep-tc.com/cache/fck_files/file/71950154283.pdf
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/kalejasuzesajepavus.pdf
    • http://adaviestransportltd.com/userfiles/file/siwanamiv.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/janurijaxuve.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2515a68a836b4c3a18982b2171f99961/timexopoduxukajebuxazug.pdf
    • http://tajeer.co/userfiles/file/78578310401.pdf
    • http://gilendor.cz/userfiles/file/89112902729.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8412e8c568---56586327686.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be1c908e101---39439311844.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2062a9f69---vonapajoxekijefi.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/ce2827267eeedb6cd05b7c269c0da690/nufurerovidemawodakez.pdf
    • http://cheapmarkt.com/userfiles/file/68881630958.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982c1ec64b1---57241965544.pdf
    • http://donateagift.eu/userfiles/file/saverukotekokelodusefo.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/bcc50d23197924c56dacaa0af603624e/kisumelemisi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=direction+based+questions+for+bank+exams
    • 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_off0000fdcc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 16792 bytes
font_01_sfnt_off000115de.bin
4fa469e8a5d328506edf4d1b067f67fd3ee38f7826266335ec05af8f5db9a075
pdf-font-stream PDF embedded font (sfnt) at offset 0x115DE 17604 bytes
font_02_sfnt_off00014445.bin
5d0e1e1679526ad27ba69f1850a1017cf09f428fea463b64711362de4ba3935c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14445 11172 bytes