Malicious PDF — malware analysis report

Static analysis result for SHA-256 215f4d3600a11f10…

MALICIOUS

PDF

82.4 KB Created: 2021-08-03 05:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a7f27a1468bf9d80dec6635f33fd3b7 SHA-1: 019c24bd099fdc70bd98cfc997ecea408f9c99ce SHA-256: 215f4d3600a11f104f21bd1bc53a4a2d32254d1847f0020bd96ee5bcd6267362
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://clinicaveterinariamontecchia.com/userfiles/files/dodobimumezagabafudeturo.pdf In PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160705b216c836---25306216649.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/zikakelifatuzazog.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/vapepudojomapanuluvi.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78853713166.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/ponemiluxadujevixo.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/86811245810.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/gosunofetepafipanofupa.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/juzezu.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a33457bf56d---muwemipemolowevepig.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/17992e2357dfb4ab6dfe9c2cc376a425/zogugepoxetiluwa.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/wotegenuvowujejunataga.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/mosesutiji.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/64335863944.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/xejodagifumu.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/zudutopa.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/33694647301.pdfIn PDF document text
    • http://sherylrobphotos.com/clients/56056/File/fitis.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/pamuxel.pdfIn PDF document text
    • http://camonetinternational.com/files/file/jizololojasipupa.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/3a8ifjf10jodpgnlv72s0mtikk/1305411648.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aca3c20dc6---pasojopodur.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/24429606643.pdfIn PDF document text
    • http://htwy.com/upload/file/gerigup.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/loxuxojepeso.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/61904171139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=lesson+4.4+practice+c+geometry+answers+prove+triangles+congruent+by+sssPDF 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_off0000d89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 17188 bytes
SHA-256: 5a8195394328ff9b1920eda064e2aa14a1bc72e880d54bcf68b341cc98d91341
font_02_sfnt_off00011d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D83 11324 bytes
SHA-256: b72b7ae294b91594cfbcdb693c69ba130a4c64351ed9906c2349eec31459db1e