Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4df4df92c1ed8b…

MALICIOUS

PDF

91.8 KB Created: 2021-08-14 23:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2569c37713af1ad664341bf235a619c2 SHA-1: aecabaf726a040dc38a1d7468d7e0dd4655396f0 SHA-256: 8c4df4df92c1ed8badbab026268c78a5c6f73e0df359d64a29cce79fcb4a62d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lead users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://atolab.it/wp-content/plugins/super-forms/uploads/php/files/e99e7d7f5c43a378f1ad25c08327e9bf/gobadu.pdf In PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610c412fcba36---kurabejokudotubowovexama.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a046c125ee---94464891418.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/wugurinekajozudupif.pdfIn PDF document text
    • http://gibisch.info/files/files/12313092042.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/a2766f32c39f288d48fd53d4aa781f20/leripejuvovijigaxa.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/99732410266.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99c16625d1---dobewexeweninoxesu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813d143e542---32289936378.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607158906689d---pezanoderagab.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/mawofikerozobok.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/58698457c2d661ff80daebbffa7cc021/54030181574.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/modipukopiguvaxigi.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/92221496686.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077d35c63ef6---tuvejerope.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/budaduroba.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/f3kg17o6a3nssejms32jdale91/2631058466.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094b4e31415b---7849301350.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/14038616880.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d1461a24682409b35faecca6f8a0f941/95103221421.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/11440723876.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/35261181913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+format+text+in+facebook+messengerPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 2540 bytes
SHA-256: 3367b1d27ec385da7c79133a1a76e63d726374545eec6b2ee34c08c1197fe8bc
font_01_sfnt_off0000e88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88B 18440 bytes
SHA-256: 09002cc4708950c834c88205596dc1591be2aee061f8abd406d73a8e79b32445
font_02_sfnt_off00011923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11923 16120 bytes
SHA-256: 946f17e232b8d3237dcf76e605f5b6ab1392ddbce0961b9f531a9521ea949dea
font_03_sfnt_off00012e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001469a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1469A 11044 bytes
SHA-256: c171c1b4198f41e32ff48b1cab7e72e2ecb65cdb94cb285e1212980c28d56f1e

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