Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a2f02d392abbad…

MALICIOUS

PDF

100.0 KB Created: 2021-06-29 01:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a47f6b2108d4e90520e237151ed276eb SHA-1: 5d2f30ac9ed247a17dc675cbdf0d034506c10bfd SHA-256: d4a2f02d392abbadf9155c52f924e1ecd9eaa44bff9227eb0bd05c6ccacffbf3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The document body is unreadable, but the heuristic findings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://irlanc.ru/uplcv?utm_term=ohm%27s+law+for+blood+flow PDF link annotation
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad6hr16ao0gbqssvr08n7reoic/94977255399.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/90661084702.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd46714498c---wagisafupuxafogomow.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086291c5aded---91011238304.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b936713d751---janejenogomilifo.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/xoteselubavi.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d5edb0dbe22---fukijileki.pdfIn PDF document text
    • http://fgosvo.ru/files/files/kobaxasixuralilosovenuda.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/5ckub5l9e7999nkgf11s4ofhpb/60101886876.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/03d9c6832ccded08cce5bec083fae5ab/57327524602.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/6hb5j71e5idfbmpvnnt4ifqfa5/64488343520.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097d0172d5d2---19187781230.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/f072a4649780def9a4ac9574bfe60f3f/37708460528.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/24bf39cc63d089f5872833f4db8b3534/12121224927.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c602e8c7a4c---4615940189.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/62280862746.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/loguzi.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/385e927dfae5dbf5332d9b9255eb3142/rakapemisadufewoz.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609217abb83c9---pebuledokujuzi.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210512135114478.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/92464596519.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfbd4cbbea---tuzomajatarokunofodamasaz.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/wibepadomatazozotisiw.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd4eca28b---12534086201.pdfIn PDF document text
    • 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_off00011fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC8 19216 bytes
SHA-256: 6f225c17001366ca41187d3ef23b0be0cd05b9692037815061ba6f61b0d0876b
font_01_sfnt_off000152d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AEB 10476 bytes
SHA-256: 2567fa9724fde666c959c63267b2680d98952ce1d8bdce2469a91e64863cf32d

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