Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7829d26dd84b70…

MALICIOUS

PDF

83.0 KB Created: 2021-08-30 14:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 05544455cfd65cf08d991a25b0272434 SHA-1: 8f565add88500ebc3c706633847744dd63c3329c SHA-256: db7829d26dd84b70e155940f9aa6f2ef471455940a9b6bd95778976505ce6d44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://studiodabo.eu/userfiles/files/61580818952.pdf In PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf8ba3a14f---ligejufakutinanopipo.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/81304869347.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/sumosotami.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1625468954.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/e9370dd339fcb5eebd2e983cafd116ec/92968896028.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/fowaw.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/87659826571.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ed6d87c41---60096283930.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/29301915553.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/306deacec3d8433698a50142592d34a2/mekebugujujakawedexoter.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79daa6b9c2---tunobepomaliputubuxaxuxon.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/45861394748.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210820023147.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a3983b07c---wosivexafi.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/c0jvj1fs6tuvkidh7msv4qdbp8/bepivubusejasuvege.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/befovufimarit.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/fijapawakokiwevejobuje.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5e86af919---99171932741.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/bivomekusowugunifetazu.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/59212799053.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/fekuwenepoporat.pdfIn PDF document text
    • https://sarahgpl.com/userfiles/file/98878846975.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/72553417452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=what+time+does+direct+deposit+hitPDF 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_off0000dbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD0 10620 bytes
SHA-256: 6aeab0dbc375ffdb613ec9cc7d970aeffcf61ce16b27086386007f04283d703b
font_01_sfnt_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C38 20080 bytes
SHA-256: 8125e5fe46b845c2fee556574706d97a1545266c5b6885ff9e66352bd6f5fb23

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