Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c09baa4096fc7c…

MALICIOUS

PDF

77.2 KB Created: 2021-07-26 12:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fb8941c4d359579b6c39088dcb674bb5 SHA-1: fca6bd158c9f7809d159f3c5b90da22cef127ce9 SHA-256: e4c09baa4096fc7c8216341264ab5aa09249fc0b9ccf9137d5c56e645bec6bde
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload storage, suggesting it's part of a link farm designed to redirect users to malicious content. The primary attack pattern involves exploiting user trust through a malicious document, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98d93eabb---lijitonevudu.pdf In PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607620de90c1a---piredugipisowotetetasuke.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/63941595080c608093fa3d274cef41d3/wuxazizurixenesiti.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/9959057724.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/7a3er40h2sn2725nd47l6b6kj5/jevaxavodowero.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/43508346703.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/15ae3582d54be9406cb7e8e257b7bbec/zipunemigi.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/52603410263.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/45661449175.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a458ba041c9---10208442853.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/3hmvq1dhdakt0ue5434kden6u7/35944838499.pdfIn PDF document text
    • http://coumert.com/images/file/34919155687.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a354cbc8d28---50337806149.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/28376647040.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48864944826.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021062711014560823.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/siledotidavaxeneto.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/90972870241.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/45686610335.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89598230c---fimiroluzivos.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/53910153318.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/remeguwem.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/227a945eeeac001c25836a3d2f44a861/zovik.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/70b7d070c22cb7fabbc05531f51b9b22/78043023596.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/aa6083edd29b7fa366c27f8b610fd231/86973547215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=1998+suzuki+gsxr+600+service+manual+pdfPDF 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_off0000c872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC872 11784 bytes
SHA-256: aa0f588083cf0dc700e231f0821e0d92ec85fee9d26c0307ad337598777206c1
font_01_sfnt_off0000e46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46F 15920 bytes
SHA-256: 1e4a1b23f408f2ac5e4e2a57b8b27567355ef8f0f9ee3a2567eec950a6953e82
font_02_sfnt_off00010d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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