Malicious PDF — malware analysis report

Static analysis result for SHA-256 487fea011f0ef2cd…

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 00:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b7c7ab631664dee47495c2c77844b4c5 SHA-1: d3cd8837699cfaea7d12d6d1972f5e53950ce58e SHA-256: 487fea011f0ef2cd51d81dceb4d55749384d4cfe5ef86396a7e1399190f0379c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://philabc.ru/uplcv?utm_term=reclaiming+patriotism+in+an+age+of+extremes PDF link annotation
    • http://arch-teh.com/pic/userfile/wetotomidibud.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/177cf9f6d4c5d3653774a59ade333658/goguvajusagogumupopazad.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/72ae9e65c55f92c29fb11c7816b1f744/buxifivafawapuzixexezi.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/44860814792.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/66789622438.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa74fde2f1b---16119097941.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/xinamozuzalud.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ee49156e8---pilelakapilewan.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210626124611_j91ydc.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d8d508f055---wuwukidusukakivigonubi.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829c47a57f6---64338931264.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2b8076d9c---baxobinatakebofetab.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbbbf63a6f---88343404796.pdfIn PDF document text
    • http://akademibt.com/resimler/files/xegumapajutifanozazi.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160889042edade---xikafiligerajupa.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/42128048187.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804a8c19f06---ketan.pdfIn PDF document text
    • http://entiambalaj.com/upload/file/xamuk.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/356e6a7df6f1f938733e78fb8adaf082/xolubejef.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/wibeg.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/darajatit.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/51064272583.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/lufekuvutalasag.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_off0000d265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD265 17528 bytes
SHA-256: 318a38d0a0e4ef6434ec6160594a66738dcc5bcd6b7745948be86242ed137153
font_01_sfnt_off0000ff6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6E 10972 bytes
SHA-256: b468b74ffa75840a59a6fd4b2e809579f0d609b520e308e1522c78bd45f94821
font_02_sfnt_off000118dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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