Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21b776200842c29…

MALICIOUS

PDF

79.0 KB Created: 2021-09-02 20:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0438ecd21a4c8b3ff95e56a8aa37dc9b SHA-1: 261aaf3c94e43c560b02a445ea850cb011a37042 SHA-256: a21b776200842c299fa2373a8ac9dda41ec910e55e39d3446e453dda8e51a361
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aiming to exploit users who click them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=uad+fairchild+670+legacy+manual PDF link annotation
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5b09e2238f05aed62155e44b6e082789/27245024567.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a097dcd4ce0---93478691158.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/33863106188.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/98188162619.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/fatujejuvuporuxusuvanefu.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/070690fb1ffbae5f9f0ea071d08ba9a8/64358997514.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/32393523531.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bba8c0bf0---kudafidemibifirevado.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/lirezinogepojigubo.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607071a73f627---gojefuwapumoxasuk.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/39722132862.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/8c5e65ec6d5170d14f072bc30c79a9fe/54598856497.pdfIn PDF document text
    • https://susta.vn/userfiles/file/72619665821.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/gugawolibebojese.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/3315150012.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/dabakugug.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/9853698264.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/f6821hrt02bj6pttit5hjmht41/viwusaw.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/xuxerifutedubur.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929e389dda8---17684202714.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f87fa1176d9---jozigegisipogonurobivez.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/k6i2tr5ld8sqvkr4beemf4nja3/14399056218.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/lasalagawopexisusuwip.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/78329349805.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_off0000ce9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9D 17916 bytes
SHA-256: a44de92186272401baeae0c3b0fbe0b36c5ff38417bc347c4a235bad5bb7428a
font_01_sfnt_off0000fd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001154d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154D 11100 bytes
SHA-256: 101f2c6db815157d6414a8e8f66087dfbc43b2750cfe3001c17969044e3b9c8d

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