Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5242b69fd2d5fa3…

MALICIOUS

PDF

77.2 KB Created: 2021-09-18 21:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d5397ae2748843b2c9235c2f4e7b1a3 SHA-1: 6e67ffb7e106069e9f7de0a3f542ac618671186f SHA-256: a5242b69fd2d5fa388dd8dc338ac0fe82858e8b5ff2fbdebd93137c668da4130
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or appear to be part of a link farm on disposable hosting. The primary heuristic indicates a PDF link to an algorithmically-generated URL, suggesting an attempt to distribute malware or conduct phishing by directing users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://viettelhaiphong.me/data/dulieu/files/zawawirilukukibidezepozu.pdf In PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/21184082680.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/dezidazusikijojadikorap.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/2960376330.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/5tbk0nrj3aklmaamji9m8rpo37/xojopetufirumunok.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/88115789886.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/ratelokenupiduteb.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/gaweg.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/17535937915.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161301a4423cbe---13195131137.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/parizusufetajifajajug.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/1n85pe5kou270950le4e82kcj1/liratezaful.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/kokap.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/limimobutotufen.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138cd52ed9fa---julovupomalajoriga.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/tapazudebu.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/95572639381.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/60086081233.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/55558198346.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/dulebosadasotejuges.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/lujod.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/38976170784.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/5b268035f198067b7a3e265b23813c3f/robadazugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pokemon+red+rescue+team+gba+downloadPDF 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_off0000c624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 11040 bytes
SHA-256: e9eeb29c23f0c50cb09be04a86e9e5f642c22ec105ef4f3b72d198f7cbbae339
font_02_sfnt_off0000f7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D5 18080 bytes
SHA-256: eb9e20be03784568156f107bec0d0833d88d5112c24fe0358fa1c830c0f9893a

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