Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2c0a14ce4e76f8…

MALICIOUS

PDF

74.8 KB Created: 2021-09-05 22:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5a3607e05bba6e9a02bbba754960abd2 SHA-1: 5ba458bda93e85b072301b96ad2d0fa5a2515a66 SHA-256: 6f2c0a14ce4e76f891b1ed16eabb6bd90f5adb50ef8d923b5a42b1dea2ac58da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous compromised websites, likely intended to redirect users to malicious content. The presence of multiple external URIs and link farms suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/f6d40a64542904a8d5855b1df9eb0cd6/kubasiz.pdf In PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/4t7qetf4dp2ugl29edb6l5r0fp/sezotejitibirekalakanazew.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/u6ti575sipl4coeincpot3oui3/xopiz.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/rejoduwatowenunisu.pdfIn PDF document text
    • http://dhf-china.com/d/files/sitigagojajejixudepab.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/tagemugukoxedukili.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107f10e689df---gebisuxozumo.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/23717131238.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6da385355---sotas.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/50af7e717640bfde5f5b2bdb41bb61c6/fubemewowuk.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/velusuvuni.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/99940204865.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/rixorelosavizetotorizen.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3f6b323f4eef7a704fea84aaafe04e92/vesekelerajixojawo.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d99f3632a94---60897823202.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/28324421804.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3a4874db6---93386720663.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e1571fe95---gabezugozaxav.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c994530e63---vomonuzijagenijeputeme.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/92221866100.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/5806620685.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/80504803087.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3cdbc0b7e---lifir.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b98415f2961---3933834825.pdfIn PDF document text
    • https://tl-systems.hu/files/files/83591122584.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/dalafefesobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=vikatan+magazine+pdf+passwordPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFE 11000 bytes
SHA-256: 04145338e732821b8ad22ef1d032cf0fcda1722d691f8d3fac5520c119c2a1b6
font_01_sfnt_off0000d96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96E 17128 bytes
SHA-256: 17b989e37f636b38d127cbf622961e2cd1c4a5bc4b21b3684d805e5d433de090
font_02_sfnt_off00010518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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