Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c311e2dcd7921f4…

MALICIOUS

PDF

93.0 KB Created: 2021-06-27 04:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5daa8baa6a6308635567642723bb89b7 SHA-1: d7898e8e773c3c9bd09f94abe08b3b8816b5342c SHA-256: 0c311e2dcd7921f4d2ff1279a301356a240c1ed3e23e37bfbbc8433e24edd4b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and is flagged as a link farm on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the structure and URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=pomeranian+dog+price+in+indian+rupees PDF link annotation
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607895e63c50f---56649732582.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/703bd2637f5e624f096f73c152465ca5/8322367476.pdfIn PDF document text
    • http://adria-ex.com/bopubinumekinubon.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/2258ca4a457c263f7fa1e688aa3f816b/tasakurikoredi.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a592fdd6157---93257832302.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/350a96ddd91e580b9cf860d8f23fabe7/xonaxejebilitiba.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j6fl85ura5imseun1uc196anr0/piverijiken.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/babekaxanafufuvuloto.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/dpj7dkqp2t11hhb7ukk03ni47h/84864391349.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/zekarujisilawo.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609d34df5fc37---zorawurejudimulexo.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/wixosag.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/16b31120c0743380df1ed0ebf55420b1/56613111591.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/kekidutove.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/pj3qc698g6mr9o9027uchvpchc/rakamaxesenajinarepuz.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ca4f7848908e34c380adc041bb85dd24/11877545896.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/vepigupe.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/6637539528.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/sosewomajurazaxenejudulal.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/7bea0d7c9ef650e6759bdbb5046a5ddd/72173356746.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/290357226173.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/78030256104.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_off00010560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D77 10816 bytes
SHA-256: cb17bf3d48840069d25e4ea77cc8dd455186ca4bc49f2e648766c2d5b3ab21f4
font_02_sfnt_off00013620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13620 18400 bytes
SHA-256: 7de0ce710fc78c86d4ca023a2f192df86555a77c9658f844059c2de1e3c88974

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