Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b87690b65c78382…

MALICIOUS

PDF

86.9 KB Created: 2021-08-31 01:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41e9367cef874b19ce0c602a66d2e36f SHA-1: 5e6db0c8c2b83379123e2a7e6521addc9f4372db SHA-256: 7b87690b65c78382ee71a0fdea02b7af2c178bce69b3f2b877b28da662fe044f
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous external URLs is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://huntic.ru/uplcv?utm_term=hypothermia+in+babies
    • http://yachtandgulet.com/userfiles/file/51751825573.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f43d90145774ad14fabaacdac5083b00/81866853602.pdf
    • https://rafaela-motores.com/userfiles/file/pavuwokiriro.pdf
    • http://alnadaoil.com/userfiles/file/68581860117.pdf
    • http://www.puhito.hu/uploads/4569384933.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf9d57a56---wofifukuvebekoped.pdf
    • http://fmi.lu/userfiles/files/36098418484.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/iqun8bd63tjd13oidpb234sclq/mabusudipenulelaneluxa.pdf
    • http://waterlootour.com/FileData/ckfinder/files/20210612_6D2435F830E98E9F.pdf
    • http://geotersrl.it/file/44582558914.pdf
    • https://santehsevast.ru/userfiles/files/pejusikaxomev.pdf
    • https://digireg.it/upload/gowojusolove.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4c5dce437---fogosuravuj.pdf
    • http://kodemari.info/data/files/23703564387.pdf
    • https://kermiradiatoriai.lt/images/files/31357128244.pdf
    • https://gberwanda.com/gbe/useruploads/blogs/files/garemekiwarogelipirope.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/mlkml90ppmskr4o910t8qp80va/65993115316.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db5c656ccf---92918881399.pdf
    • https://havanic.com/cache/fck_files/file/34029762122.pdf
    • http://phuwangnam.com/user_file/file/lupek.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/2mbj2ja3veflv10bs2ftcitv27/81349577000.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edfd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 16792 bytes
font_01_sfnt_off00010614.bin
e43d9095d42e15ab0f63d7b3cfe34d155672b4f1588083fff77169b52f0196db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10614 10716 bytes
font_02_sfnt_off00011e47.bin
9187ec7f50108a37329fcf19638913906a7c2a50af1866c03c2c259cf6491e3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E47 18000 bytes

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