Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3c4d4d4de2ae1c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-22 18:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aa7e2f111685c115f01e6e9722719ee1 SHA-1: abdcfcda677c8d23a6745fc3dda4421041f368e2 SHA-256: fa3c4d4d4de2ae1c617205e6b9dc5f4e8656959e324409c9c0897a5bda19c854
196 Risk Score

Malware Insights

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

The PDF document employs a social engineering lure to trick users into installing a browser extension or update, a common method for malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites that likely host further payloads or exploit kits.

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://wastran.ru/uplcv?utm_term=how+to+recover+the+video+in+phone PDF link annotation
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/1960238069.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/35099937296.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/rorudetinatifolaguv.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-13/20210913030648813674.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/57922020395.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/1otjc0ds7dcs57n8ii9s56amfl/47098985616.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/c85f5b88bb112e8e0b7afa134dfabb71/jaxot.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/40576038792.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/93136745704.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/fizogakivomerip.pdfIn PDF document text
    • http://dkind.net/userData/board/file/35817915326.pdfIn PDF document text
    • http://airzo.net/userData/board/file/48711623680.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/waduxetizefufowerogoj.pdfIn PDF document text
    • https://bdata.vn/upload/files/wimilurevajitapiwaveni.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16138de23f33ed---buzurixo.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/nodenemulonikujadimuko.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/23443460527.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16142c93f61da5---81493349935.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/64716623931.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/jufapukibefuwiz.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eacda10d88---33523285198.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614416dd1bf26---waboguxig.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/48520914214.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/c9fec902f807426afc4c6f4a76daf481/godazipijenuraxenozibexo.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/2573055553.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_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 18412 bytes
SHA-256: 0655d779450751843cf3e5c849d26898088c1ec43f4d432df236809c9a4c9d9f
font_01_sfnt_off000119b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B2 10376 bytes
SHA-256: fdaecb87a92839eb43949d5036d68b1ac4559145d22a3064c772a4cf9f7ffbaf
font_02_sfnt_off0001310f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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