Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadd724f5e7d887a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 23:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4957577eeee72074be14576c40364f52 SHA-1: d1894d4f41e5acc2a0f87016baab9a589d18e748 SHA-256: dadd724f5e7d887a49e51f3241a0304571515e569faf1e4d814d099f0c4e3954
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links to external websites, many of which appear to be part of link farms hosted on compromised or disposable domains. A critical heuristic indicates the document attempts to lure the user into executing commands via the clipboard, suggesting an attempt to download and execute a second-stage payload. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://cructi.ru/uplcv?utm_term=screen+share+from+pc+to+phone PDF link annotation
    • http://digitalpolicycouncil.org/imagenes/file/wutexip.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/vefodesomawopijaw.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090314180531.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/74286271390.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/95854157128.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411bb2c86fc---fujemelodogiw.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/pemelutiwerudunumoxig.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/98659339525.pdfIn PDF document text
    • http://anpo.vn/upload/files/tanideneko.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/zozagesuzo.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/vumazemofodet.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210912_8E421DC2DEC509F3.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/dejewovijebojo.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/mexutizenirimax.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140d91bdb11d---48117100206.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/65183125184.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/vesikilenotejevusilufogo.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134299336b5a---zakerulijug.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/8811f26e79b421ceb26477eaf9f9a37b/sebalaxofisitu.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1614212de43605---27170058730.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/pujejasusoro.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/kedabamijurudoxilu.pdfIn PDF document text
    • http://keramann.ru/uploads/files/segavubodevitarape.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/58193985541.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_off0000d97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97B 17732 bytes
SHA-256: 55850561639de66915ed5c2512b2e2d1bd9eb192aea1c6f19d53b2fc9bc482bf
font_01_sfnt_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBB 10680 bytes
SHA-256: 7224c1ac33f9a2c3e03282f9a08f991e9e2decc2449e1f5b9634fcb191175c62

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