Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bb23feb65b2170…

MALICIOUS

PDF

73.7 KB Created: 2021-10-01 20:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 27e6ef07b6b9e38d3163894723a77aa6 SHA-1: f113e5e3db16ec7dff8d0d629965e227585c859f SHA-256: d3bb23feb65b2170525c1fac21c906d2baff0ec3a79555f8f569ed42346c2d5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous links to external websites, many hosted on potentially compromised or disposable domains, indicating a link farm or phishing lure. While no scripts were explicitly extracted, the PDF format can embed JavaScript for malicious actions, and the presence of external links suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/zanuxupaz.pdf In PDF document text
    • http://kodemari.info/data/files/20633170433.pdfIn PDF document text
    • https://swiz.eu/files/editor/mumerutikol.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/1052086720.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/54371561790.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/5237247771.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/36581331014.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/98303773056.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e4b4312418ab9b019a6d77010c52bef3/zisigi.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/13978392786.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/pipomodubizilo.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/rekekisoje.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/barivusetig.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/8395497239.pdfIn PDF document text
    • https://ambalatender.com/upload/files/kagibovobi.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/16474194984.pdfIn PDF document text
    • http://helix.chuing.net/mai/ckfile/files/rorixabanolemafepabof.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138f919da277---60420302916.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/44338133948.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/44295906242.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/xosazadebe.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/9690599607.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/40421750780.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/73623827440.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3cef847f7---tenabigajo.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/bozizoragetevebovivib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mi+remote+app+not+detecting+mi+boxPDF 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_off0000ba65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA65 10876 bytes
SHA-256: 86d94fbb407c2eb51105e01e0dc2e4a30b19fbb6f6181b6b740111e75d93b9d8
font_01_sfnt_off0000d315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD315 17776 bytes
SHA-256: 5b04319c9d112cc894f9dec80f452c95b0c6e4eb2e062effcbd575e79895c046
font_02_sfnt_off00010097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1