Malicious PDF — malware analysis report

Static analysis result for SHA-256 0618708c27779c62…

MALICIOUS

PDF

99.4 KB Created: 2021-07-30 18:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e16c75e3b030a5ae91699ae9b89bc6d SHA-1: 26339ea6dd4219bf55e2473c7101eb145e83a9ef SHA-256: 0618708c27779c6282ada4142c9afca31919108a746cc8f8d646b897cc595f83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload locations, indicating an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f2804fad0---3168788735.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc242a675---62504002477.pdf
    • https://accidentmatters.com/ckfinder/userfiles/files/51661613145.pdf
    • https://girilawfirm.com/content_files/files/80589557733.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/cbe4ae8d9c1465f58421aa652ca848e4/ladeleniten.pdf
    • http://elementsgogreen.com/userfiles/file/majepowi.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776a6cd0517---lokugofekofomabiso.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4796e776c---43065103977.pdf
    • https://tch.lu/files/files/togokaza.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a798c0882---64817692310.pdf
    • http://saigondome.com/uploads/userfiles/file/mijatinenagodiw.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/71fceb345764691f64e9246b58c6c7ff/valugotiladi.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/2859cd9dbacda1960dc3c7e68e35d3cd/46875746270.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902320e963b---mewarulixexu.pdf
    • http://debeight.net/UserFiles/File/95907900763.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/bafe51c50f47bc17cb52ac665ce91d1d/53104129371.pdf
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/rurobi.pdf
    • http://richwoods1969.com/clients/861079/File/juzaserijifet.pdf
    • http://tafgambiatours.com/userfiles/file/66960685881.pdf
    • http://pphu-joanna.pl/fckpliki/file/56875098041.pdf
    • http://pagyesa.org/userfiles/file/20210718235140.pdf
    • http://erdivigado.hu/userkepek/file/tanejuxo.pdf
    • http://maternites-catholiques.org/ressource/site-image/files/91113848408.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=download+bully+2+apk+data+200+mb
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/88b99f65310dc5c127785ca86844655e/jeruwodazonakapunoxoni.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001132e.bin
134bca7a4af4e0b9b63a7ecb01e05fc86d8758a75454dba46feb6a125f64fe38
pdf-font-stream PDF embedded font (sfnt) at offset 0x1132E 10836 bytes
font_01_sfnt_off00012c0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0A 16792 bytes
font_02_sfnt_off0001441c.bin
56f4b8289fdb9548ad12f93f84470622b2441132e59e37edd24fce095143a888
pdf-font-stream PDF embedded font (sfnt) at offset 0x1441C 22844 bytes