Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f166c37e996c70…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 02:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2cb55b0aa99acda68637b20592d5e6ce SHA-1: 4a860b92a73a601b4305fd668ed6dd705dacd289 SHA-256: 64f166c37e996c701d7482d00412b57fda9a14195a267d9b209cb67f68a8d49b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=house+of+flying+daggers+watch+online+english+subtitles PDF link annotation
    • https://irantruck.ir/data/file/1764000096.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/44778076655.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/wibafilugilafazukejix.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/xotakipuwujag.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/80147169495.pdfIn PDF document text
    • http://terminsk.by/pics/files/70006153022.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/tizulaz.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/cf5961bf19bdd83dd1df6f68cb86d354/nevomixitoduginumivenu.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/tonupilifusadisatibirukin.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/75034192333.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/xaviworepugetepatafuj.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/puveleruzesefolutusuze.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210907095729_1983782584.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f47e4c6a4---82212871920.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fad7f6eb43---1875215191.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/25159094025.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210908_7CE9DC23D1EB8742.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/5dfea9c4e6a1c82c720259017e39bf58/pevezukewu.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351a02dca9a---ribijatu.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/polowowogunif.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/46643172922.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/26541267833.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/lawiparog.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_off0000d6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C3 11184 bytes
SHA-256: b1651bd797ea3136a0c1cb17eda8f25e53299b4886db1b2e885d259f2b74483c
font_01_sfnt_off0000f0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 17660 bytes
SHA-256: bf0d13ed5167a7ece2938be220b0dc5d5b1460241c24043eb511e171efe1b7f6
font_02_sfnt_off00011f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1