Malicious PDF — malware analysis report

Static analysis result for SHA-256 57197cfc213bb323…

MALICIOUS

PDF

89.7 KB Created: 2021-06-28 10:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efa142619de3df14ecb197e4e9e4980b SHA-1: e3bd04ef3e2a40a2c9570ad3ae60bfd1a56aa750 SHA-256: 57197cfc213bb323c1a95f387e4b3bb1a6c49179099bf488f76f5ab16d64cae6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or exploiting vulnerabilities through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://cructi.ru/uplcv?utm_term=absorption+of+infrared+radiation+by+atmospheric+gases
    • https://ptogel2.com/contents//files/lafutodafe.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/06d0e24d8b6332a916cdc0b1d6d682e9/vanogudekolubapubog.pdf
    • http://terminsk.by/pics/files/metusufo.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e053a6afee---sovegagamutu.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f4dce22f---69012386749.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896cdf2f54d---tamumumovatifilapevesem.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8503e17de4---67336660799.pdf
    • http://usaoxin.com/userfiles/2021-6/file/46074266424.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/bf9ec9c6dfd5fa907cd96631f9ac487b/jixinuvabix.pdf
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/66444451372.pdf
    • http://www.findvoters.com/userfiles/file/35121096112.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/5225dc84e0bbc2992a2985294f4ad808/pijudexigere.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607801462c528---58587560466.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/9ceb1ee75d7d43beb86e2a3ea39936c9/34271868773.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160915f5fed881---mesatagejamelite.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dabe317abd---zadimanuberawurinegavi.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160b56b90eb9f2---42116884368.pdf
    • http://brlairport.com/images/file/nonezufogodafivedagupipam.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/88489121604659dc8573985267a21588/zemobupunadosoja.pdf
    • http://naturallabs.de/userfiles/file/77959257678.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/87717414596e11bd648686285db3b83d/dagunibikutulu.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/16u8t3o07cl3ovaiiu0gj083c7/lumapaliduxa.pdf
    • 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_off0000fa8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8D 16792 bytes
font_01_sfnt_off0001129f.bin
438377997f84b0653d39f15221d18a2f419851cd558e8f884c30eeae5844d96f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1129F 17060 bytes
font_02_sfnt_off00013f4a.bin
c2989673a25730200d2c3cd2278d275fd635f8289052f2e0f443aa6105eec1af
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4A 11256 bytes