Malicious PDF — malware analysis report

Static analysis result for SHA-256 f140a3121e7b9eed…

MALICIOUS

PDF

82.9 KB Created: 2021-08-12 04:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b9df4db87d50fd0a2b0c06617c449328 SHA-1: f316d18d80b3dd954a0a9216bb8c0da25b4050de SHA-256: f140a3121e7b9eed233a5eb8e859cf947c8a518b3f0d4946427f8e09f02eb040
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites, specifically utilizing the formcraft plugin for file uploads. These links likely serve as a distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070ce9f3cd02---wawuzumuxosisogotib.pdf In PDF document text
    • http://kengosushionlineorder.com/uploads/files/50760676553.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/84149996131.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9884bcd51---57888963416.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afba09ca1fc---82655867492.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/39065709053.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/62132a47c7b2dd2df13a11ad1dd87980/nepovibuvulasikesan.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0415a1835---76814108744.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/f0vf24dvqkj9leekd6sp7g6tf6/90846565767.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/62054609999.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/sefokokuritili.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/jumujesesuvawawujutuva.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/47031823348.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/katunipusadifid.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/fivenazizozipedazomezamib.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/jr8ict52k7odvlck1ub80gokc2/totozavaluguzemoboxumof.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/76e0uimh18uhm1o5g5on1lqk31/vupabozetalatumur.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f831b40263---64913740803.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/42869419254.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4620df2fc---12169202736.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608700a940191---lifefumatuwoto.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/tagokerugos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=kung+fu+hustle+full+movie+english+sub+free+downloadPDF 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_off0000e29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 11184 bytes
SHA-256: 987478d0e60e447206c32715ced0f681f4372655467de1fb6df42e6cc404092c
font_02_sfnt_off00011481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11481 15988 bytes
SHA-256: e1dd7aa63952ec50fa06902f873c62a7507158fb854fab32606236198b308e19

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