Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca1f5e7b097d736…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 17:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ad7ad73d660b5bdb48c4cc81965b484f SHA-1: 8bf6e87bb4e272499b69d1127299eaee9bb92ae2 SHA-256: aca1f5e7b097d7362c981aba6ce35d6a9a4dd26789e4f03183f08d268aa7bc75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://inwebjor.ru/uplcv?utm_term=bossa+nova+piano+sheet+music+pdf PDF link annotation
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b38a4c0a61---56917666031.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/51402930819.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4jbh716jh6nhn9pus5a9i2psl/saxatarefitusesarixas.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/55983118799.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a46a6c13912340ca1dbed3638c5fe8ef/42926482400.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/gexegojejofurexoje.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/jitedezakaduj.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/jamenegukasigokenefadew.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b76fae78b5---taxukivejavuzileziw.pdfIn PDF document text
    • https://seikai.jp/free_images/files/64438813674.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/29ogltm7nmdto9tbct3i2h3pfs/67933078885.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd8b6e2426---janifenuvoxalazenoga.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/219ab91a481ce14eee5bd15b0c793678/genegi.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/55531291114.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/nuzepoxujolejuvegi.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/pafebimibukefipufujig.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021821614235738.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfd2452ecd---jinaxiwifenujujub.pdfIn PDF document text
    • https://x-software.cz/data/file/xofevuvavadakadalon.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611aecfaad754---badigamomofonaxivorefaxa.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/zuvogimupunenavojugozek.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/2761020860.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/podugopatokiratarubiwosi.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/f14ee82b9a4d2e1b1777354814d60d08/ludovubezogoxoso.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_off0000db25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB25 18648 bytes
SHA-256: 82c747dc6f9423b55855f0263d64f1791f46f5127737f05a85b3c0607872815c
font_01_sfnt_off00010b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2B 10960 bytes
SHA-256: aa022e857090a07c58aed10f2ff40831fa8355a5309f5baedca9388a6b4b180f
font_02_sfnt_off0001247c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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