Malicious PDF — malware analysis report

Static analysis result for SHA-256 646e4f86975da83c…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 13:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 34f3a7378bb980577bfc4a2be355d0a0 SHA-1: 25396398dc23ca0523610900bed078c10a1c2630 SHA-256: 646e4f86975da83cd9bd36b6e9f09d97f412cc208c28797b9aa9ed8277265010
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan PDF. The presence of numerous external URIs suggests an attempt to redirect the user to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://sirinthepgroup.com/userfiles/file/defomil.pdf In PDF document text
    • https://architektor.ru/uploads/file/27047462907.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/79388760412.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219101535511597.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/vamowexajatexite.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/6829858445.pdfIn PDF document text
    • https://teamcode.net/upload/files/16676610483.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/915dfe2c968b3f94b0f992257cb9b1f8/98385101106.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/nuxaworemolibajabijejojar.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137362119952---rigunomejata.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/2ea14d80f9ba497a91691fb50a24952c/xokuvijemipulesotetepage.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/tatigekimapin.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/gosiwatuzukuzogodaja.pdfIn PDF document text
    • http://duef.ru/public/file/xusipifizoz.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/grf1pg99l6uiq7nr3s3odse7tl/wofamu.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec5f6ce8c6---33491594277.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/14510689970.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/6325645147.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/16619310549.pdfIn PDF document text
    • https://btegypt.com/file/4924864241.pdfIn PDF document text
    • http://inica.org/files/file///pabimusuwakodujoroxam.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/6f26313952b58cf9c24e60c5067f09b1/85083505319.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/59202278620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sincronizar+contatos+do+gmail+com+celular+androidPDF 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_off0000d3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F7 10948 bytes
SHA-256: 73c0ccdd30f74c9e3178845046dde5a541cf91dd6e6294ec627f93bf4505c6b4
font_01_sfnt_off0000ed25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 17736 bytes
SHA-256: 4b0dacf7c89ff27ca390ba42d0cf393931071c872ece4ea61abbe23648216a3d

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