Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a47e8029c72f317…

MALICIOUS

PDF

101.5 KB Created: 2021-06-27 14:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f1b895bf753c6c976b83827cba8941b SHA-1: afb49717963df86c5e4f50955f0bcb56027817df SHA-256: 6a47e8029c72f317cbefc370358f9de528b7cc2012cc06b692096331c3ff5b24
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. This suggests the PDF is designed to lure users to potentially malicious sites, possibly for phishing or to download further malware. No scripts were extracted, but the PDF structure itself is leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://cokhitienvuong.com/uploads/files/kinenujujojebujivinubag.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/84458542194.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41b0e35064---dekupupunemidubapu.pdf
    • http://group-anons.ru/userfiles/files/fofebanimamutudi.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/148bc9a4dbe41af28f0c6aeca12efd24/51793059935.pdf
    • http://ngor2-3.com/file_media/file_image/file/42019184220.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a034712486e---58307478510.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/b3a963061ec5cc5a1d8143d71d95fcc6/65262242626.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/0r74mbmd159gqicdv3c4jnnt73/zowidonevegegi.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d7bbeba9---fuxijulelikogegug.pdf
    • https://digireg.cn/upload/nezepazovuxivusexoruwefob.pdf
    • https://amitadevnani.com/userfiles/file/majusukibefidez.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a69b1c0e34a---manowidadowuzuw.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcac6cc74bd---93275919487.pdf
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/kosuvekenawumoraliduk.pdf
    • http://kaupa.cz/userfiles/file/61599636106.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b6f887d4e---39569354165.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609413b3a125c---52097554541.pdf
    • http://jaatkinson.com/userimages/60370522793.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e372de57b61cf761645b19f40e128091/36232790862.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5d356ddac---5755256775.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/br0u8f8uhofb4ktp505q8r6oum/81430608628.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/f2eb2f5ebb58a2735dd1eff348abbb6f/50195619224.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tibial+epiphyseal+fracture
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c1a.bin
6c7861c28f16fe048d7ee2bcb9f24b3f1988b76bcc9ede11097715282d14d48d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1A 10668 bytes
font_01_sfnt_off00014485.bin
6f52250583e2b5550712459094d62ad05fe22eef4cc3f73cc04d8da2b24ceb91
pdf-font-stream PDF embedded font (sfnt) at offset 0x14485 16960 bytes
font_02_sfnt_off000170ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x170EA 16792 bytes