Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41cfbdc72990bb9…

MALICIOUS

PDF

77.5 KB Created: 2021-09-10 04:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aaa1252435702eff39210cdd214e9f3c SHA-1: 0c763dba9d9c9ff8d62fae50e5d4d95afd168cbb SHA-256: c41cfbdc72990bb94f901389eea56a7859173b0b760b85e754bd865f07d35125
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farms suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/77526891010.pdf In PDF document text
    • https://trvstore.com/userfiles/file/kipubinemi.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/jokojavozofasuwemafubutaw.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/48273687841.pdfIn PDF document text
    • http://quangcaovuanh.com/vietkiendo/upload/file/wagarupuvenogixuvemov.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/12557123794.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/4417624416.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///57151318400.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/47466133798.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/nobigitaxiluvejubaxosi.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/vigimeraxigunep.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/15555513901.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/5267eb758df2dd9834669ae4549a6930/3802824560.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a78dbb307b---fepatiniwuwafo.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/zefizilukenasaxudojavuzu.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/62467458086.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3921af0e649762b40d1806ab460fa9af/95595389494.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7c769e48b---zumotukuguroperisu.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/sisavufewipujabeveg.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/40270030017.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/92669552644.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/nusevalinapetud.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/18533553233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=free+steam+giftPDF 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_off0000cf1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1A 10264 bytes
SHA-256: c69d3470a9fb4b46274f70ebb184d84fe56134f75865848452053635e815b512
font_01_sfnt_off0000e635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE635 16364 bytes
SHA-256: ad713e3debbb8f38bcd7275e7137af76287df234a0cabb086d3f20c5160223fe
font_02_sfnt_off0001105c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1