Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e1e156a0c124c0…

MALICIOUS

PDF

95.5 KB Created: 2021-06-25 16:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26c20c8778390249dd3d805f1d9e238d SHA-1: 288625c675cdc7daad74c8f4071cc30e941d57a7 SHA-256: f3e1e156a0c124c0f88184aa1ed8e1282a177e0c768914d2c8bfad1a40a34f2b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://fresh-j.info/images/uploadedimages/file/77703702424.pdf
    • https://teyadegitimvideo.com/calisma2/files/uploads/77273059841.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa4963da7a---pijadagipera.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/bhige1ruakjfnjkftuhi5inb6u/71527935746.pdf
    • https://cowichanmusicfestival.com/userfiles/file/foloboza.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a861561cf47---fuvokesixibinenozel.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073c0c0ef894---fibibunenuralipep.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081fec308826---18023453289.pdf
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/34969127315.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bc3d16bb9---nelabobewoveleralulus.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b106b94b16e---bevaraxosexi.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b8f56cc3fea74e5ec3cd308e97e4cede/nakomowewobotokadutopoku.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/5bf017b8053d613005df58b897909a52/likevokavasor.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/hjeqhphrulbh1rd1gk3f7rn8ts/34477230100.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q0flcao4mtr1mrv0n270ttkap4/sulafa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+mantis+parts+warframe
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7D 16792 bytes
font_01_sfnt_off0001028f.bin
6803bf5d02d0eb313a9141ad28a4748b925e45780fb8141aa06aa796fdd601a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1028F 18172 bytes
font_02_sfnt_off00013268.bin
33ad6b754f78befe44fd997a41e3b23dab7cdd96855bc22dce52925640c21339
pdf-font-stream PDF embedded font (sfnt) at offset 0x13268 10732 bytes
font_03_sfnt_off00014b13.bin
2a320f490e7ee4a2511664d66ac1a4d81a37f8d658752fc8dedcfb97ab93c4d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B13 11600 bytes