Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c5da8c62170987…

MALICIOUS

PDF

88.4 KB Created: 2021-08-25 06:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dcbe3ecfb43fbd383a1a04229db0ff66 SHA-1: 0a6772835d99ba057e3d4da0473043665d7cb6ba SHA-256: 10c5da8c621709877a7bd56a6ce45597b73ba4826519418aaef9f6712c8b4e6e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with critical and high severity heuristics firing. It contains embedded JavaScript, which is often used to execute malicious actions or redirect users. The PDF also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage legitimate infrastructure for malicious purposes. The presence of embedded JavaScript and the link farm structure strongly indicate an attack pattern aimed at user redirection for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079b3f491917---37888946102.pdf In PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607864eed7bc6---pipujulolapebusoreb.pdfIn PDF document text
    • https://cityface.cz/res/file/38428787032.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7ff0d8749---84863217355.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0efc8b2a9---51391753857.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7ecac420d---65378461256.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/38179493861.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/2ce941ac8738a7887e4c355ef4aea3e9/94805246850.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/41765662067.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/revamuremujisixuzej.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec8a23a8e9---magisidanemusitiz.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39be296951---namefe.pdfIn PDF document text
    • http://bociany.sk/media/file/93662600786.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9680e583c---47447409338.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160794ce0aa1e6---xofemajewalalosokogipel.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/pimejijuzenasubixipe.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/81953414690.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/93e8c06b4a8925b9b68afdf3cb140d65/66407131934.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/levofupiruxasakamuralato.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/65776095833.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/92738997815.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/sagavad.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/93790900207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=paper+craft+house+decorationPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 17900 bytes
SHA-256: fff54b7190024a5c7064b11b90ecefd5ac63e549500c10fe2cce6f3ce832cfaa
font_01_sfnt_off0001233a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B51 10772 bytes
SHA-256: 02cf2f377c8c9c060547fbb5fff78af3efaf70bb7822905e6f4725aeead9106d

Open this report in the interactive analyzer, or submit your own file for analysis.