Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a39cfec9589b7ad…

MALICIOUS

PDF

88.7 KB Created: 2021-07-19 09:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6872c7a9cc56a558526d13ebd0120c04 SHA-1: 61636ad1d6d4ec4039c2cf3f53e390ad0565fb61 SHA-256: 9a39cfec9589b7ad571c6571e23545b29aa49209cae33f5704f8b371bca1e1b1
156 Risk Score

Malware Insights

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

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. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d205b2ee51f---pizewetu.pdf In PDF document text
    • http://helder-effect.nl/userfiles/file/mokebuvozemipimiwox.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160b4dde6b9373---40125093366.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/toranatotukisuzazawakuwim.pdfIn PDF document text
    • https://xistenze.com/files/files/dudejonilerijetonobawe.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0b5f0a3560---vedelupefot.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/siwilenowesurelilukete.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/kejiritibiposiwukimoj.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7a85c6a82a049763bc069808212cfbaf/jijirida.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097268fbeafa---50606730594.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e55476fee6---35929389125.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/vixitosarate.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01a86b2580---29188758511.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b9eafdec9b427db68bc96ac584c7e9cc/11353544323.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/disiwir.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160825d3d71ba0---10749288434.pdfIn PDF document text
    • http://short-story.ru/upload/file/42815391932.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e1177dc0cc77e10ee19d52739ffc2c3c/kidov.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/87mbmou7l6ep0pnv9pt0nl2pk2/79474529369.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/8d36fedbd4207b9eebe5eb2028fedf88/ragoziwemazeraxab.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/dbd3a0a2f18295cc819c5094b0bfd65d/63114772639.pdfIn PDF document text
    • https://lemanssrl.it/file/jexelogo.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/zuwebegokukamifel.pdfIn PDF document text
    • http://evola.it/userfiles/files/tinexeren.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609d355483cf6---jozuvejazeno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+end+of+history+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 10464 bytes
SHA-256: 463762e8766c3386fc4fb99e93855adba0756c7d48eed39d55e60543967ba45d
font_01_sfnt_off000111b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C9 16804 bytes
SHA-256: 63b3c66fb7c5716052f749157aa62f6695bb74fbf0ab5d9f3ce85b54b6a3ed71

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