Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a9caffa9c62fb1…

MALICIOUS

PDF

87.8 KB Created: 2021-09-23 10:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ffaffa58b3cc83e21fe8dfcd4d5869c1 SHA-1: 7e48dd9d5edca688230cd9833eeb605cbb1aef69 SHA-256: 19a9caffa9c62fb176faa08d9b92097de396f5e9cade9135faf2b1ede0190678
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristic findings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://csom.cz/wp-content/plugins/super-forms/uploads/php/files/c335cfa7aa41055958270ef7203d3772/13274170049.pdf In PDF document text
    • http://contrast.no/ckfinder/userfiles/files/95248726853.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425c0fe34c9---vixojimaw.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/7msjom9d0rfphkuqoe6f67ret2/78995673355.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/ginewotujok.pdfIn PDF document text
    • https://camelcarpet.org/d/files/59433360809.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/80409234187.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/51439279353.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/momokipazaf.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/zuvigivobu.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/fc2bfec1ee0e19ac258ce26eade8f49e/xoliwuzasevajerokupafeza.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3fa8b6880---52250083074.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210914114315.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/63508127528.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/dowibafutepibumezusa.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/64340172784.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/feleva.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/nuveralununewuloladaw.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614849a54543f---68358873959.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/lefedon.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/libavazaraguzowitip.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/59058228302.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/pogufe.pdfIn PDF document text
    • https://pt-lb1.pasarantogel.com/contents/files/belirikaberilasaneribemew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=love+aaj+kal+onlinePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE34 9980 bytes
SHA-256: 42b9e86fa5ef69a33952a747466bd628013c645b7fbee3d7fa7c508bd2109cac
font_02_sfnt_off0000f456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF456 16264 bytes
SHA-256: c55f1c471becec1d495de47b840b8959295954bcbb620d261c79dab6d2490d6d
font_03_sfnt_off00010a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A53 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_04_sfnt_off000112d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D9 23788 bytes
SHA-256: 41149af99db63689cd92de78557d292db1743cf5691d49fd509c4cac0ec7f6a9

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