Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f020beea225466…

MALICIOUS

PDF

81.3 KB Created: 2021-06-26 01:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a852efd133a6fe95e4beaad36971d9d7 SHA-1: bf6abcf86eaac2e4db97aba955624aaa1b173ed9 SHA-256: c6f020beea225466a089ead04913c88448a115c008e1651c89caee41b48d9e0a
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of these links and the overall structure indicate an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/n643q9q1pt5lubf8ro1btrmsl3/73770132993.pdf
    • http://xn--om2b25zm6igqb.com/ckupload/files/51214281874.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/2b936cf4305625eb30784353cc46805f/mevoraxuwobikefivotave.pdf
    • http://prosquash.by/data/71504482784.pdf
    • http://pensionpoint.cz/userfiles/files/demujarumegazuzotur.pdf
    • http://naturalmis.com/userfiles/file/53276246012.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/a26ff6125e619690fbb66213e9fbd0bf/nitivugonibudemuvubofim.pdf
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/93683787696.pdf
    • http://anaminfo.com/attachfile/file/67925724840.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/k1q204gmbj40rcm8ananbrpflc/16199826278.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/71bd515ad668444c4be169373b1d3e08/bobixupugewusebokixumitu.pdf
    • https://123natura.com/stockages/files/17748180564.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/d09n6ltpamuvesslth8ou3gu34/50140823257.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/b854brnu24pt0bigunqs7ppl1f/64472780036.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2e5ce5ead---vatakujarozovewasowebe.pdf
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/vixinalibuperidilefa.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/83947211500.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/54302548670.pdf
    • https://fanaf.comarticle_ressources/file/41647346891.pdf
    • http://plafondchauffant.fr//img/user/file/56076476843.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+become+people%27s+magnet
    • 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_off0000db9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 16792 bytes
font_01_sfnt_off0000f3b1.bin
4325e6415262cfe1333835d5ca8eedf5312b494a575728ba2a0350ba9727358c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 10776 bytes
font_02_sfnt_off00010c69.bin
903ecd2d73825478031f65064e6059e779cb54cc64a4650da9d7bc5047b72536
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C69 17076 bytes