Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb16dfe2b087a7e6…

MALICIOUS

PDF

80.2 KB Created: 2021-10-05 00:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b0ae9d0513b2389b26be6a0f88b74dea SHA-1: 37daa183ca66a758614c04fde85598df2ed18e32 SHA-256: fb16dfe2b087a7e6acba84b7c396bb8cda6fe1e348532cbe60f319dc73297709
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious link farms designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://crysiq.ru/uplcv?utm_term=how+do+reduce+pdf+file+size PDF link annotation
    • http://iseveranscopy.com/upload/editor/file/jilemunotajafe.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/vefuv.pdfIn PDF document text
    • https://ivanamihic.com/files/gakofabomularawugi.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/2291434817.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/76302752474.pdfIn PDF document text
    • http://attlas.center/userfiles/file/88011998592.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/nitimatituxakoz.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/82700308349.pdfIn PDF document text
    • http://ozsersogutma.com/upload/files/mogafidilunerelore.pdfIn PDF document text
    • http://poultech.net/d/files/tepidanelime.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/87591b29a8433650d479281b7252447b/raxar.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/96904104172.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/64535363030.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/94437632883.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/nejumujimilonejatubumu.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/kelonigunitikofu.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413fbf1d68c---86385723863.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/xovinewig.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/95540524448.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/wopumat.pdfIn PDF document text
    • http://goref.ru/files/file/78852043693.pdfIn PDF document text
    • https://sjaindonesia.com/sitefiles/file/2457489870.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/zesus.pdfIn PDF document text
    • https://sambelteri.com/contents/files/30632066710.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/verubadowolukepexox.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/77651085466.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/56843996533.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b746a69fedc8fecbc6ef99453f767478/82509464117.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD147 19376 bytes
SHA-256: b50de8e420d8918c37eb1c15b386f9a456feac265ee24c2781b020882fa1f91d
font_01_sfnt_off00010362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10362 10488 bytes
SHA-256: 4f51cb87390abcd43dddbe7ae45d8cc4f630b0ed5fa903b4aeef8c1d7cbb8361
font_02_sfnt_off00011b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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