Malicious PDF — malware analysis report

Static analysis result for SHA-256 4247da9dbc182c50…

MALICIOUS

PDF

83.0 KB Created: 2021-09-21 03:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df561c0cabecdd28fd99f6e1bf964c89 SHA-1: 71cd2630125826fd9586d28f4c35d0f104df975c SHA-256: 4247da9dbc182c508290479bd98e7756b73fe102842ffc7fd25324a32ad0613e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://catamma.ru/uplcv?utm_term=her+blue+sky+anime+watch+online+free PDF link annotation
    • http://uniquehotelsolutions.com/files/others/32516705796.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/41052328391.pdfIn PDF document text
    • http://itena.si/uporabnik/file/59742102611.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/sisimitegok.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364afb1faf3---muramerunebijo.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/gegupuk.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143dcf34a9bc---29490190153.pdfIn PDF document text
    • http://rococosofa.com/files/files/sudagamadabuwad.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/65364186530.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f49cc68d81---59356029379.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/vuvuzulokeretixiz.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/somajavuferidisina.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/6311520613.pdfIn PDF document text
    • http://cecev.com/stockages/files/14510362560.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/sudolowixake.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7aafed84b---mikubafilijisodimubik.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc45a1fdb9---61433442764.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/rerozeboparufuf.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/koporewisoxipedisijodotaw.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/60448133126.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/jijujawugijibajesumuxi.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/94596511501.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_off0000de41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 11124 bytes
SHA-256: e808b9ae48bc6abce950711c3bc7813816ff6556bf5700f2a3653760522bbbe8
font_01_sfnt_off0000f81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001102e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102E 17640 bytes
SHA-256: d575b7bc903ad6ddbc81e82e42ad55185c8b1e67af2204557af367983471b5f5

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