Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d931a6beff3591…

MALICIOUS

PDF

98.4 KB Created: 2021-09-04 18:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4b9776043c70567a6c4be339bc213c84 SHA-1: 738473f929f468b2f192ade20b989c3e4b910742 SHA-256: f5d931a6beff35918ec24fba6773cbc986ec641ae45131d46d326747ccfee313
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://pestresolution.pt/site/upload/file/vanatuxibusefe.pdf In PDF document text
    • http://aapltd.net/userfiles/file/49410240450.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/nmglmthpsg31r4vo046k5sevhs/wivoli.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/45591859542.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/73081596829.pdfIn PDF document text
    • https://produsedecopii.ro/app/webroot/files/userfiles/files/misagoxasanukojegifip.pdfIn PDF document text
    • http://northcity.rs/slike/files/23172992831.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608acab719f11---47572535498.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8deb7b730e---nupazexugumomazuju.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/56985503109.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/50f8cd8960692388a58362db6ea9b0e8/56808054267.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/61350957116.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/1dd8f9b854a05b0756d81dd0939c75c3/duwawopiduxivilezowadib.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ff313bf74---11880314513.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/eclpkojs73pru6i9u3tbmgorl2/fitibimu.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/wanenitolozo.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a406b73569---wajeduromovu.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a854a2107a---44186504749.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/difemesideb.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/kagivipedifivelupajopotox.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16081825e5a7e5---6585096503.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/79722588678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ni+based+superalloys+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_off0001135d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135D 10620 bytes
SHA-256: 74c9db8e408a164fc2cc5f9bb8c5abc638e069690a8744759a2fb74518646849
font_01_sfnt_off00012b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8A 21884 bytes
SHA-256: a7afc90f4a67f08c5d9653fdffdacd0dea0efedb1aed32069c283c7617809cf2
font_02_sfnt_off00016467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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