Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9fe9c2741b6cf12…

MALICIOUS

PDF

96.7 KB Created: 2021-09-02 17:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a66d91fd5df46e27d11c2a0a32fd79e SHA-1: 5353701f696197b7c730b47c4784ac11e8e4ac5b SHA-256: f9fe9c2741b6cf1292f4f53c57ff14cdff68d5b9946ce6f079a9aca25bcd8930
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true malicious destination. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=daewoo+kalos+2004+manual PDF link annotation
    • https://quangcaowebsite.vn/uploads/files/50557596591.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/xepizaperulefodinej.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a4adfe0b2eecb1f5cc1caa72e64e7316/54190004218.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad85e8cdf4e---mobizujurojonuzapu.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a850e362ee1---lafirasevanit.pdfIn PDF document text
    • https://mfdesign.hu/files/file/xaperuwetonivufemeruzidax.pdfIn PDF document text
    • https://marigabung.com/contents//files/wavebefozoxa.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/705pu45tdnijqlns1b16bdik2k/54580717648.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/zufujijasoxolovokipofavu.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/xufilurimawevefubulisul.pdfIn PDF document text
    • http://schubert-hh.de/image/file/savuga.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/97868792401.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/78q673s4cd4gf2nstkbp3i0anf/zekajowa.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/8401d943998bda5d021678dd5537e15e/remuzunimokumewurakefe.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb648390c92---57736309262.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/vetadutat.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/fapivon.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c4374b80fd36ef2eb4687c1642207699/84646940609.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2f35d5620f9b3d803649f08c9a49962e/zefawisuse.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/92736537749.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/11108112084.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/rur9h4p950r4kvuqdsu1qiuc87/jerivoditupolujiwepodalo.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c1aae6796---41167706247.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_off000113d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D6 10580 bytes
SHA-256: db0a512cf59c82e0ae118e2b96947118efafe27b6c98c01b692d694c8a6fcf2f
font_01_sfnt_off00012c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C24 19048 bytes
SHA-256: 9246ba69edfcd49413a05a04c7be3aa605b7987cb0595b5014e8ab7c2b62dc2c
font_02_sfnt_off00015db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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