Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad251e7094142c3…

MALICIOUS

PDF

108.7 KB Created: 2021-09-05 05:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1bae4dbe4995ef87eb97dab5e3373d31 SHA-1: 442d26aea232407e144480c08da57105da675f7a SHA-256: aad251e7094142c34cd0fcc97c03b4bfb1f4ed81fe2063c94300706a3f960ed3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://angkoronetour.com/userfiles/file/11172435689.pdf In PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/pindhfoddkerqbp90tbt37rq86/nigugitijis.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/nugunepov.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/gitololimopufitipi.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/kozimikonetimevuvalutarug.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfe2c1ac32---5009493618.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/joduzagaxejixatuxoji.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/e5da415e5e63f009ec937812d8ec1ad2/xojumobukozuxajamevu.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/93169183068.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/jefotixug.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/gisodumobov.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/83888905054.pdfIn PDF document text
    • https://bselink.com/userfiles/file/xunev.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/jakuvozufanapevufa.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/5fb71ebf69da275657164e93199bf789/xuxibawilipike.pdfIn PDF document text
    • https://pcetravel.com/files/file/nirupumuf.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/lelesejifetigazezaxewug.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/rjjdhklosola95b5r3tkufgo72/90223777480.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c103379ffb9---kukixidizasufekiwenofivo.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210809080439.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/83885775164.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/849jvmdg7upfnbttdpp89p9gkq/tobulum.pdfIn PDF document text
    • http://kaies.cn/upfiles/210531075213712583z98fnf.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/gunimatesoreb.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/pekabixojasarenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=national+action+plan+afghanistan+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00018739.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18739 18428 bytes
SHA-256: eb0d731df869a4823baafa9dd22e5a9888232afe0088bcd8546275c0f598dd72
font_00_sfnt_off00012c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C44 10644 bytes
SHA-256: dbb467563e9f160d84eb261ed878fe5c3ad1b0bcf8468e1c0f243b7c341c487c
font_01_sfnt_off00014459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C6B 16556 bytes
SHA-256: 7fd74718f31fd624bd949f553eb6a30b53da8ca79243611f8d2c9000d4161793

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