Malicious PDF — malware analysis report

Static analysis result for SHA-256 39fd64e80ef86d32…

MALICIOUS

PDF

78.1 KB Created: 2021-08-25 00:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4b485e211e086b505cfd8535cddbfbfa SHA-1: 6ae98f3a76511806b51490f5c88bfdcc753ef679 SHA-256: 39fd64e80ef86d3240262b464daa93d506356089de30111aa5566dc374812914
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this PDF is a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=defeated+crossword+clue+6+letters PDF link annotation
    • http://kiiga.ru/userfiles/file/jekikevodafuxinususumibu.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/dimipow.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eda85234e52---40779668888.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/defesopinabe.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/keritabelinonurana.pdfIn PDF document text
    • http://zlato-stribro-investice.com/upload/files/baresila.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/ugmh6egv1bdhafj0qu3s864n27/kaxipuraxuwesabupejigawab.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wizizin.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/biavbkgskvld50543ngmgs7684/dewupazukadi.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/sasokadijuvoderisebu.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b366bb293---3767448169.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160904d302b036---rujikutejulololibemarifow.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c424ceafbf6---87214766455.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/jjohj0hhhm8fvfall2tc44lbs3/muwawajuwurumorurotu.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/k3glqli90v48f2mokelgdsi7c1/petataxevawoni.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6441ec2a41---27269201834.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/guzax.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/43221139462.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9dcd5e0c5---81306894728.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f63f19dfd7b---bajap.pdfIn PDF document text
    • https://cubic.is/userfiles/file/52401741516.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3b845950---puxagakorotokezaxufakuw.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/6381667661.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78ddbb01ba---85197608552.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_off0000ccb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CB 10628 bytes
SHA-256: 3fedbd18c09ce7725497ac536533a86af51925b768dcb29d4db0e975d415adb0
font_02_sfnt_off0000fd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5F 17060 bytes
SHA-256: deb45919c9568c00cb803a6ce04c256ed4ed6ea6e6510faab6ea02078a5a4b21

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