Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6792a8266e154e…

MALICIOUS

PDF

82.9 KB Created: 2021-08-30 09:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c53665d7fbd5df5a5f95451fd892aee9 SHA-1: 9d84663284dceab1b7f29dc7f957f8c97869de2a SHA-256: bc6792a8266e154eebcb1a480f1c4e22a3786310481e246f9edc715bc146211a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5e5d4a4ce7deb35388856e0a1f917741/60286305268.pdf In PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/048fbe9de83e396d7a56feb99cc8511f/72530523083.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/6pp5fvdo6uca9749s5tuacb592/mijosirunurinobib.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/mobitaguji.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126dca167fc1---wejezaxuditebavi.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/829885b802b9cd6225ee624c22d2243c/lijerojomiwisawexe.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/sexinixirurowatux.pdfIn PDF document text
    • http://calisnt.com/uploads/files/75660746287.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/xogudenabeziluma.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/siuj9k987vr1tfrsaqm1dj3kk1/gujokoj.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/h104a6rbu4hv7ufodugrgdqgt0/29420523778.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210625223158_tdet3x.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4fe994444---poloveduditejopid.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/966a0eceb149edbc9ed9b567bebbc8c9/68951024110.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/a8jmm1qtj7g4b303jb5j0dot6n/bibefokizuv.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/firetemuketixojupedalox.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/367023204be2d866a285633f27c31311/duxesivubitofosotorit.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/newuwazudojorox.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c05bbe4c28---moxotujap.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/15607346578.pdfIn PDF document text
    • https://ka-base.no/images_content/file/fovujoriribovenakapa.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/b89df60a987b0977b3c3a269bc7eec1c/mirizesivimikefemam.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/tomewumojoroso.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/rusekifup.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/dunidarumor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+save+pdf+as+csvPDF 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_off0000dd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 18728 bytes
SHA-256: f859e6f9eecd337af8539a272246f9ecef993b29400d67d21d27388d7e28da50
font_02_sfnt_off00012597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12597 10416 bytes
SHA-256: 77e69289eaccb713dd7f09e364e92daa35439272cc1fd75e065c728e29b45258