Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cbaa8fb11bc740…

MALICIOUS

PDF

78.6 KB Created: 2021-07-31 09:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f5b6a921d5e8d93e6c8583459035475c SHA-1: 83f252e4f3cddb4e0eb26d1c52a25087e4bae964 SHA-256: 37cbaa8fb11bc740eecae990ea7ea600fd0c586de6a0043b3c917e3ccf70445b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised CMS uploads or disposable hosting. The ML classifier and ClamAV also identified it as malicious. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links strongly suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://avgdesign.com/userfiles/file/sedupezefox.pdf In PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/dumize.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160907c1d7722c---95631320636.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607da3a397606---tokupapefazunup.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a2e06c645e978ea589e11ab2804cef6/24914932480.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/0321f6157d7cecaf18c6e1b4ba667964/6358491965.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/33586509040.pdfIn PDF document text
    • http://derma-dts.de/files/file/33018414123.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac36c1c138e---guxoviso.pdfIn PDF document text
    • http://coffee33.ru/archive/file/migituvoxebufi.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/73821187403.pdfIn PDF document text
    • http://twilaw.com/files/files/mapox.pdfIn PDF document text
    • http://absigorta.come/file/73838230641.pdfIn PDF document text
    • http://prosquash.by/data/bipenorenulojof.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160814a4eb7a84---nigiliraroputenari.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/jituwunakiviwofafunowiw.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/butisodugozis.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/tesaxowemaneru.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/59678391163.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078922844e51---xegubasogetowujodemu.pdfIn PDF document text
    • http://arslanemlak.com/E/file/28401965333.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f524de1afd---ruvebeganivomurel.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2f4c1a5e9eda53f0f6a968e0ed7ccd56/38008039732.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/5580021246.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/fowoziwuzapomibiwokip.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/36748597208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=2017+polaris+sportsman+450+service+manual+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_off0000cc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC71 16796 bytes
SHA-256: 0fc0e0b866a000559811c416c1fb8f6d6333c8ffccba4c7af2e3152b11a40ec6
font_01_sfnt_off0000f84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 11408 bytes
SHA-256: 8e8df53380b9ecf0c9e445555d93525997ede7e3d46e1cf2517d8a0fba9f015f
font_02_sfnt_off0001136f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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