Malicious PDF — malware analysis report

Static analysis result for SHA-256 008f929f21c9f32c…

MALICIOUS

PDF

124.6 KB Created: 2021-08-11 20:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 751916e50adb180614d4af967bb2faf4 SHA-1: 106c9ceca967cb347fb628d5a002412d2ba9627c SHA-256: 008f929f21c9f32c2069e82e42115f765003534e85b7ad6ca7db174510c0731f
196 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a phishing lure, as indicated by ClamAV detection and ML classification. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs the user to copy and paste content into a command-line interface, a common technique to bypass initial security checks and execute malicious commands. The presence of numerous links to potentially compromised or disposable hosting sites further supports a malicious intent, likely to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://anhuizpyy.com/upload_fck/file/2021-4-29/20210429101230562642.pdf In PDF document text
    • http://rainbowcaterers.in/userfiles/file/35208602738.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/71jskv88b4eqvcc6m72sa6ake3/96027820505.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/tenomunigurimisar.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/58600663299.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/862e5ac87a23774c55cc12a127e91be5/56227333009.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/765281491.pdfIn PDF document text
    • http://npas.ru/pic/file/59848107200.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca23b824d---daposiluzoxabivubak.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/13715184017.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/duburipigotud.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/bexusojusu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a53158d65---92136518449.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3e9a132fb---zanedojes.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9ed85e43b---61431831353.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/b3ba71490665226ab6e063927979c3bd/4298419309.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/26151d7fd5258df221de8f83a0a0e105/tofomikopobafuferik.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/monabutorow.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/manaravigo.pdfIn PDF document text
    • http://bienbao.org/uploads/files/65832960056.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/9d82651018c658bf833c3ae6af3fd63e/8708277246.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/jufuzagapibi.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74062144101.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/n1si1fp2fe41eh6694682j4g82/seteroga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+uninstall+carbon+black+linuxPDF 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_off0001816e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1816E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19980 18480 bytes
SHA-256: 52f8f77d346d4c4bfb6110118dd7da1080b9ab6fafea0218d413deec46ad0730
font_02_sfnt_off0001cad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAD0 10600 bytes
SHA-256: 1f1daabd776ab2b3ff5a665a27481d2c479ab3778d0748ffa910322c616815b1

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