Malicious PDF — malware analysis report

Static analysis result for SHA-256 0778fd7ff6a0a9a4…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 04:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 67f27fa5c75077f07ba8061a0091c772 SHA-1: da94f08bd3d9732fc31baa44e2db60932e78274e SHA-256: 0778fd7ff6a0a9a48254b883f272853c386f9366502c9f40fbb16952e09b02f6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://medvor.ru/uplcv?utm_term=propiedades+fisicas+y+quimicas+de+los+alcanos+pdf PDF link annotation
    • http://studiosaletta.it/userfiles/files/kowapikolazisinofo.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/tewosapedigub.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/16002911314.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/xiweriraj.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c929ccbab27---19032817750.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/jovewazaguwejezukutinini.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/ruvopivibe.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f010129d496---42188314610.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/3608b32e65797b420bf7d782e8692f8c/71013781710.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/domisotexatuzoxurebodi.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/fuginefuxakujamegapiwoko.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073a5e4e488e---suzixuj.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853b3105752---564737366.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/6364962382.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/jenonof.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/16e92d1851e3a89ef0141846e2030634/vudorulebijixalumagiguz.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a8f0989a7---7437222016.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/jodakodunegifevevupokigi.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/werereninokalilusaxu.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/xiduwoxuduzamarinibada.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/moxilexilijaro.pdfIn PDF document text
    • http://gibisch.info/files/files/venezodorotuwikas.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/52157379173.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/revobuzilurejanowijeriso.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/zanax.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_off0000d73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73C 18852 bytes
SHA-256: d9a92cdc9559551f5244719cfb4adb714c580a645ba93fbd6d156e7ca98ddb41
font_01_sfnt_off00010742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10742 11044 bytes
SHA-256: 750048f695057590c9a2db8266872e167d4903001c1134d63a79ff30dfa6a315
font_02_sfnt_off000120b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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