Malicious PDF — malware analysis report

Static analysis result for SHA-256 0813d165e052ad0d…

MALICIOUS

PDF

102.3 KB Created: 2021-06-25 19:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4bece3d2e27ad433058b48a41f401a77 SHA-1: 79899065dbd6eed316642f83d09d4d9851a1e7f2 SHA-256: 0813d165e052ad0dd2f0db0636f7fc7e598989976578d293978a41686b81c4f3
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a phishing or malware distribution scheme. The primary purpose appears to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9358

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://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a53c8c802---47360372694.pdf In PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/41f721f2acdb09c9cfbad29d72bf872c/totudupavasur.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/46515464981.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/sorinavewam.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1ee2e25847325a09c78e6225698b2b47/98492478958.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3ad285367e5429a0aa8f154ed53a1797/17151831736.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/nbm9en8jfn5eqnq1j1t566c36d/tezakizenofile.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7664f165d3fe42cc8589c4785a10c685/45790908992.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084371a6a37a---78499026453.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b7734201---81625138987.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1622612052.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/47061380816.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/bosepila.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/307d78f052dfc04f23348d7818803068/31354197969.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/xedogifirafatonikubifuje.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/libafuvuzatosomedov.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ce81a02ea---39635118077.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f014261c3f---14045622180.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/68827299712.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16078e3ed9c5f1---tozojatedizejijekab.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/cfc2b33161502d3259b43d4f2b9c4c93/44293239760.pdfIn PDF document text
    • http://rafaelokazakov.com/file/releguporafejafig.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/45b8f26bd7f67b02178e07aa7082831c/nawitaxeve.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/kazixujojezaje.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081d87ba1003---daritid.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/459c7a89a54f1fe6114022bf288cdc90/zasokuxikovip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=inflorescence+of+marigoldPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 20936 bytes
SHA-256: 8b3ea01057e10a20e8d95913e00b38957951b04417c4f4d400558192186ff35c
font_01_sfnt_off000130ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EC 18640 bytes
SHA-256: a880fc55d769a47ab5a90ccb58f29a1697cedea63774e8373f9673d24d7924c5
font_02_sfnt_off00014eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000166b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166B9 2860 bytes
SHA-256: eb4860bfc82aa4381a415eec22e167bb85ca231c64c549898309d732bfa3c59b
font_04_sfnt_off000172b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172B2 10672 bytes
SHA-256: 49312fc4a3672d5d352b16ccbe097d7787f0b186318f1fa98009dc1f4425b421

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