Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f06902fe3a9c46…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 02:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bad6552207590a0d2f38ccc2f26cc557 SHA-1: 4eceebed7dee4158ecfa5b983213588158be3fac SHA-256: 64f06902fe3a9c462dfcdcdad7d739867938237b4354392c84837f438fdabc18
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous external URIs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external links and the nature of the heuristics strongly indicate an attempt to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://pixomot.ru/uplcv?utm_term=easy+to+learn+chess+openings PDF link annotation
    • https://magerp.org/upload/files/56063765613.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/8977744320.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073a6aeedf87---sazunulalevajizu.pdfIn PDF document text
    • http://sy-smile.com/upload/files/vegakesadowuxudi.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/nedofijobesasasuvalisu.pdfIn PDF document text
    • http://veitali.com/upload/files/tiponogati.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/02efo2pf48n4tb6rbe6l0bl483/29541245571.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/92275694597.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/buguxomerapixiru.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/morifitide.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/loruxodufid.pdfIn PDF document text
    • http://polkovnik.su/upload/file/34123527173.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cbdcc949a---zanugozujasodoxedak.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38c71296aa---bepalefuzivagazuwakufa.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/98023383132.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/23mvrvrvu2024icnqlenq8g2js/71362339185.pdfIn PDF document text
    • https://2acontractor.it/images/file/47944955185.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/27376049773.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/43080983325.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/fepixe.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a02d4f5dbf2---56244034440.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb6ee097b52---17795100895.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/468c8d118f6acebca1c0019c31c74623/murabatozozutixuvobajepu.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16093b2820b36e---fipefo.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/bupitexaxulijuzim.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_off0000e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 10748 bytes
SHA-256: bd69f1477975ad994b71090c584c4ccd0d3b3890e9d643a5370ccceca775a8bf
font_01_sfnt_off0000fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 17252 bytes
SHA-256: 00e2eb71cb6e02a1a79033b4df9ec892f5e66167ef6ad0a420f4064b4b2eff47

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