Malicious PDF — malware analysis report

Static analysis result for SHA-256 6984d7eb2cd8e922…

MALICIOUS

PDF

116.0 KB Created: 2021-07-29 20:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6cbe33f33c11c855ee8665b74e95e94c SHA-1: b1de2a22f3814ffaf06d1def576c016a6cdff681 SHA-256: 6984d7eb2cd8e92247bdc3ed0e1cf9e0cb32e76081a75d25aecf645f942bafaf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content hosted on these compromised domains. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/716f981b21f65b96f261da2e15ed4d8f/mevisafajexi.pdf In PDF document text
    • http://medicaldistri.com/ckfinder_files/files/sujokefeko.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/xexadanibetire.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/36a88ceda6a301fffbddd01c909003e7/13696025595.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/47803e3a177eaf6acfa4705b886c8f54/vozidiza.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607348e004113---zadaxawi.pdfIn PDF document text
    • http://armanetti.com/images/82249868814.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/79501591543.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/82674645260.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/0rufjk8pnhee1gqn8cmcs2702q/diwifumonufuputimukutul.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/wonupakofebepilitokipobew.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/8330757466.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c90eca874---75021935172.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/dc77f479494362992354b6cc5d6bc31d/66732870275.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/vusolebuvesobuvi.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/54338476317.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608932bf46f76---zuwomisalupazorekuge.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rimadijasamibosuv.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/2548be41e0a3cc923425ae46129dfd4b/62829314362.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/wunovidupavemibinaweju.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ede6cb044f---72384023175.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/13721120571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=catalysis+by+organometallic+compounds+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_off00015d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001755d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1755D 11348 bytes
SHA-256: 79a9f1420110d173e456450145cfd6705c54b41ce10363667e9021440a44f410
font_02_sfnt_off00018fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FB1 19108 bytes
SHA-256: ddab8a36ad70921e4270b43f9245f386c6865bac79968ea90a12e469de8d03d2

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