Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c13ecd259ee76f4…

MALICIOUS

PDF

84.5 KB Created: 2021-07-05 04:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eeaba3346b376967e4116275c9dbcb36 SHA-1: a5b2da756b3eb67f3d70e231814626c92f0cfe2f SHA-256: 6c13ecd259ee76f442fe311ea4aba6cab0a104d60406e0410bb9df9c31035982
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the URLs and the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=chicano+lettering+font+generator
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaadeed034---wopazapupud.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/0f1dfd44185e03c93a09d6a412962bb1/jilumebux.pdf
    • http://andrelandberg.com/userfiles/file/gojigutexikapowofejur.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a952e2a63---mavetebenuxisidapexozimu.pdf
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210621094926.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/uhfp8kq3m29qljptviuj970ehr/82027359541.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e85aa948e0d335655c66e585bb666583/31809458873.pdf
    • http://c-amc.com/upload/files/xavewulexun.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/59d159c4489b37cb1fd7e0f0bad9ca4c/3464950784.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a2213dc8---zutaz.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b326f403c2---boxodataxamudekolisuj.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/fulimudibixifobabajitaz.pdf
    • http://gintaras.cz/userfiles/file/bixupavaladiwaromotu.pdf
    • http://inannamsao.com/uploads/files/60245655995.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/o7cis3pu5cqspr5rhqdn822qu5/vunomuduzudaw.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/ckctndl6h995jntso6aep8r39e/3632795460.pdf
    • https://atkarisuli.hu/userfiles/file/30654496277.pdf
    • http://m-camper.ru/ckfinder/userfiles/files/34150096202.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/0214634bd3c0515f21df2f646b3deaec/duwozereziwijogoxex.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/0b97c40c730496719790792fd7f6c66e/gupevuwufusodarirojulejaz.pdf
    • http://pettwayfamilyreunion.com/clients/39389/File/xolokilufole.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2774d1ed8---43532486602.pdf
    • http://inglewoodreunion.com/clients/68690/File/gexazisoboramo.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/1524d5fcf0d9b78b2bd40592751bd16e/kilukujitotixev.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_off0000e7df.bin
6c7ecd47983c3094b804b5d4f8f6a0c3a151b1d390ef514f8dee32e7ffd63bb5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 10476 bytes
font_01_sfnt_off0000ff9f.bin
2eaea871acc920e472bf1cd8f01649251afeb45ef91e0b46cc0bb8347d06083c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 17516 bytes
font_02_sfnt_off00012ca1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA1 16792 bytes