Malicious PDF — malware analysis report

Static analysis result for SHA-256 686fcd5dd46fbb13…

MALICIOUS

PDF

78.9 KB Created: 2021-09-13 15:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 475b5ecfcf0679cfcb33f3a8979b4a15 SHA-1: fe1b2b54c52c905d2989121980875111bbc34ffb SHA-256: 686fcd5dd46fbb137ee391a88e1dec3f2e644771168cd400e0b50876ca8124f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links, including those pointing to compromised CMS uploads and link farms, suggests an attempt to redirect users to malicious sites or download further payloads. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=sniper+3d+unlimited+coins+and+diamonds+ios PDF link annotation
    • https://searchkar.com/ci/userfiles/files/rodalopilovitizob.pdfIn PDF document text
    • http://gerocuki.hu/user/file/zegedotivupapavebirasejon.pdfIn PDF document text
    • http://consade.com/userfiles/file/wukof.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/86187761559.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/78473815837.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/fizizopifewifonufe.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/60425744027.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/c16ea7ad52b054a1ac0cf2cd8b0bf76d/16025447137.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613129d8737aa---25373015871.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/butol.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/zibegupoxovalos.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/16064394645.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/23433408050.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/75339380829.pdfIn PDF document text
    • http://scro.ru/pic/file/sedasuxile.pdfIn PDF document text
    • http://geasit.it/userfiles/files/nupogekotewedojetanozir.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109080132153675.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/dapesiledubawoxuvitabemu.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/sudeloleziwosepem.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/12593764108.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/goliwanoladuwiguza.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2b8843264---kekopafazufiw.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/56280267368.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109131414109759.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_off0000cf53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE765 17316 bytes
SHA-256: d58ff71e9ffe9543ae5d087756f4dae26c2e05e2e7d74b4a9b8a7250592a14b2
font_02_sfnt_off00011463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11463 11024 bytes
SHA-256: ad161c01fa8a37f9a2f59dfaa610a14f3aa14b96bcc8f6d737aab3ea126f11f4

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