Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08b3bbb0ddf0239…

MALICIOUS

PDF

89.3 KB Created: 2021-07-16 03:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4a7650cd1b259c4c7bc7c819fda0cded SHA-1: ef8ec3b603fb4bd5e9120d482b3749e2bfb2eb42 SHA-256: d08b3bbb0ddf023933301cd262aec908f3bb3f6a83761889e20abf9bb90840c7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://coretry.ru/uplcv?utm_term=app+to+solve+maths PDF link annotation
    • http://aeronautike.com/userfiles/file/8523719907.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a354d4ca82---75075859388.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606edbf92b707---nixikisaxeki.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210628_024CE31CE4E85A7C.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/88693761057.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852372abd90---xisegig.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/19997717870.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/fowabubomovoxo.pdfIn PDF document text
    • http://cl-pub.com/files/files/67709389906.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b13f3eed2ce70ad25c4587f4f4e7d395/wobevasorujukule.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/79d24778fadb9a654d665b3b27c6fcfc/bunopopulapelevofirepe.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/zexuxodam.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/valfqglguam3gji40toeppgbjn/8889703406.pdfIn PDF document text
    • http://hncastlecable.com/d/files/10662009135.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/63557268223.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160be7eb0f0f56---vimidogegeliguxaluwo.pdfIn PDF document text
    • http://meta-min.com/files/44830319725.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/67d36b07a2cfc83c2aac96d2a3468f2a/33607182498.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/aba8892a2b91c99a8af59fc17ad571be/92519120356.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/xetejegifewogodomafokuw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803d85b3f51---kizemela.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/70657921230.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_off0000fa82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA82 17232 bytes
SHA-256: 7153273bdfabbf35de3a765c434e61ba0ec2987a07ed4dfab13740155fb0d289
font_01_sfnt_off00012760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F77 10268 bytes
SHA-256: 4ae3b4029eb51d9a09785f6475d761a07576b5e4a406af950839d826330f52a9

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