Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0df1a00afec4eb…

MALICIOUS

PDF

71.9 KB Created: 2021-09-18 18:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64fd86213427a6a9f33c9c8895d6574c SHA-1: ce6fce58fb725d34b91eccf79d64467888c7fb5a SHA-256: ad0df1a00afec4eb1065ceb3c7f7a6347ee5bde9e82afef4fe612d85ea4afc50
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable domains, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns suggest this PDF is designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://yuanjiangchem.com/upload/files/67402937003.pdf In PDF document text
    • http://tuzvedo.hu/elemek/file/19581012259.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d67010db616e5b013509fdd2cd09a51b/89521283554.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/6e83725bddf3e3dcfe9d9dc4a2fe66e7/fegivevidakifelinofam.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a83761528---momixaleratu.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210910075720.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/36263608780.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/18043367572.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444b5886e6c---59631219823.pdfIn PDF document text
    • http://24cvety.ru/upload/files/firatidilulemoxoz.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/78351496567.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/vamunefixakasamexutijiren.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/dosoxonasunabiwo.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/79601764726.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/gudaxubituxosusiga.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210904101436.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/kidogurato.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/59877116073.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/bapinexizazafutapu.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/5064662381.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/5512f5c13f82eb57c9413af2cc65e490/pogopat.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/74766255102.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/77534493095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=9uhd+9filmeshd+series+tv+onlinePDF link annotation
    • 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_off0000b889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB889 15968 bytes
SHA-256: 5518dfa94b621aebea3e13260c96c922f4970366908c091223017187669b7726
font_01_sfnt_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 10692 bytes
SHA-256: 1de07492b635da380c7cd21dda9d999bf83f9f3de4cf37288efc357942d3f5f6
font_02_sfnt_off0000f9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1