Malicious PDF — malware analysis report

Static analysis result for SHA-256 144a7f70ed9b9f6e…

MALICIOUS

PDF

75.8 KB Created: 2021-09-04 01:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fec1d4a8d034bb3ff80e0560d0ead9e5 SHA-1: 51e5269b02f6e4b8a9f618a5fc167fa9c48081ea SHA-256: 144a7f70ed9b9f6e7456c7ea7f178ec0c52e1580ec93d84f94c50d27e2a79907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of compromised CMS upload links further supports this, suggesting the PDF is used to funnel traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://anoh.net/pds/userfiles/files/pesopenit.pdf In PDF document text
    • http://royalleasingny.com/admin/images/file/jidesoj.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/bc0a0aba04c058f9bb131795c6467a54/68521522405.pdfIn PDF document text
    • https://tekartltd.com/upload/files/87836629517.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/46189836085.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612573886b4e2---lixuko.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/jipidiredagonozamudedikag.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///2021611452567652.pdfIn PDF document text
    • http://calisnt.com/uploads/files/22459245304.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/56509480012.pdfIn PDF document text
    • https://primer-spb.ru/files/files/xasora.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608197b01628f---zixolowanuja.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f2cba6b04fa---bogadotarewisuxuken.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/e3970aea20d66b14cf5080260bec6e98/18244481645.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/62116758145.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/89015770209.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161165db296aa9---sixidakuvuwipibukepelo.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/mekisef.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/dixafojerebiveref.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/25421715580.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f80f0c5f7e---37780654502.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/69174482543.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/popuwefazidudolo.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/tigufedego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=adb+commands+cheat+sheet+pdfPDF 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_off0000c231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC231 17664 bytes
SHA-256: ae93fd9c859c116752c479f13cb8b98b9b86d15828ddf4cec1fc9782936d81ef
font_01_sfnt_off0000f0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 10768 bytes
SHA-256: be3350abd724df9f9ed2c70c02f62a4f65f7cc775c3e7312fe8b86cd2f885e50
font_02_sfnt_off00010910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1