Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f45f315140c91b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-05 01:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 116c67d91581ab6164281a78b3bbd21b SHA-1: 9de382a085d00d7fb969b7ca12423f0d84a5ff88 SHA-256: a3f45f315140c91b8aded69e46d1eccbae13f55a7b9fb9d86687fccddcd3b1c5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. This suggests the PDF is likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oancora.com/ckfinder/files/niriwux.pdf In PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/bogebalixikibarosiwuz.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/larezegovofogovamadudusib.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160eca42c3b75b---89835870755.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e36402a48---vazojuvuzolagosuvavivis.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/51070856699.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/gn9t5fkc4dhd4t4fp4oh403aog/wivozogododijilapovazidoz.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/77416497755.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcda54eb95---komokiwopugetu.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b660d029fc5---podezor.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6719995918---fixajupedegugabajukefu.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/suzuruxunefefi.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/92ab075dbb04a22a3a197efb509c0b62/57630095162.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/givizoruxiwi.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/tunisuxobeginibadopedifa.pdfIn PDF document text
    • https://norservis.com/files/files/89906056202.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/dileraxizilafuweleva.pdfIn PDF document text
    • http://balone.net/_upload/file///3959992903.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/8ad24110a533c2613cff2e24e70de3f7/77454772720.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f9e8ea5a7547881b331b77bcaa0ae817/fawubelofirarure.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/19559349472.pdfIn PDF document text
    • http://citra.cl/userfiles/file/tifikobavogetera.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/48eaf669740fc0d9ddaef5c9f293173d/31047523187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ayurveda+books+gujarati+pdfPDF 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_off0000b6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DB 17324 bytes
SHA-256: bb02b83db274f59d439a1776f6c7308dac2fea7d07a527f5f29f01e89d12657c
font_01_sfnt_off0000e26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 11148 bytes
SHA-256: cf7cb09a4ad6a9f08d9aa45e43fa32c16323ab6addb671f98c6b80a00cfac995
font_02_sfnt_off0000fc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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