Malicious PDF — malware analysis report

Static analysis result for SHA-256 376021a1993fa842…

MALICIOUS

PDF

76.3 KB Created: 2021-09-12 03:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bbcb77ef7a2f30ff34358083419130ba SHA-1: 9f71b6262c5a5c20cb87090256f7d77e8536e553 SHA-256: 376021a1993fa8428d61d1e39802c8147a58c1ec5e73577714230ea23c9707c2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' highlights links to compromised CMS upload storage. These elements strongly suggest the document's purpose is to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://allytemp.ru/uplcv?utm_term=wifi+key+view+apk+no+root PDF link annotation
    • http://betonkeritesek.eu/Content/files/boxogegokulumidipemux.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132be5970b77---43112901554.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/jilamepulukev.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/90812551147.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/22326152800.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/ririxajiduruxulanubozos.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/67241889324.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/14956304816.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/75850080463.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3b9f77529---51605702444.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/bazexorudozopeki.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/89273149972.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/pegupopenugaxi.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/xotixipedon.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/71584061472.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/79108552f865add275016008abe295c2/93086833408.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/80284880041.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/58835987075.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630567767.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-11/20210911181541903085.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/45117713822.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/zaredamofufivabo.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613808fc8ce69---daxirokijapaxosusutubu.pdfIn PDF document text
    • https://adikkedua.com/contents/files/3472722410.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_off0000c4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C5 18116 bytes
SHA-256: 498cf2670191b1d7e8194f2cdbd7846cf10daebeaba92e548d5b2b9d0857e5b0
font_01_sfnt_off0000f37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B96 10488 bytes
SHA-256: 65626a5be95ab42bdbbf3a1d8521f3b891aae25a620e353ef4aef4481982a4ce

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