Malicious PDF — malware analysis report

Static analysis result for SHA-256 13931b7369717f58…

MALICIOUS

PDF

82.6 KB Created: 2021-08-24 13:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d6ae6c8a7056e606788a215615325bf9 SHA-1: 5bd922213db0a207ec69151c28b3ed423069911b SHA-256: 13931b7369717f58305d77ecc4a998b8cf772caeed9b164dcd2338d81df5246a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, characteristic of a link farm designed to distribute malware or phish users. ClamAV detection and ML classification strongly indicate malicious intent. The file's structure and numerous external links suggest it's part of a phishing campaign, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.alex-vasilkov.ru/images/wisdom/file/bokad.pdf In PDF document text
    • http://www.awakohchang.com/image/upload/File/0652416824.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/54175737738.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/xanipesalisajana.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/59167403995.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/vuxewolano.pdfIn PDF document text
    • http://webursitet.org/Files/file/45729125801.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/40719000135.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///4809971534.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/8ccc0d46d8fc9471d48a766fa955df06/tadomagoriwadinixuwuref.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/kiruva.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/nugimug.pdfIn PDF document text
    • https://kede.org/userfiles/file/sotijawonadixuzolarojav.pdfIn PDF document text
    • https://unosms.us/userfiles/file/pafewubidunusuroxizono.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c963e7f051---48477986484.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/97376029181.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/66023410879.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/82618850286.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/66940521315.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a60dfce1569---68958335485.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ee1a54a30ee33f5aa24a0aac1529cec2/86170174865.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1312308114---wipofowal.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/8778273018.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/tugapirepurevubabu.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8a42082cc---34632896859.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818d65772b3---nexil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=management+and+organization+a+critical+text+pdfPDF 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_off0000dedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 10948 bytes
SHA-256: 11968a2df5bad135ce4d38959192705b345777065904df0c8e3e548d488717d9
font_01_sfnt_off0000f804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 16884 bytes
SHA-256: fc85900d7df0d26223171a58328efe0ab13a45a45cd6b00579ef679319f1973e
font_02_sfnt_off000123ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1