Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afd84e64138fa69…

MALICIOUS

PDF

71.7 KB Created: 2021-09-15 15:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f4738fdc33a89f1855919006b651b597 SHA-1: 42e090337e9d88e8d153d48a0be4bb2d16a7e7da SHA-256: 7afd84e64138fa69224fc9e4fe53a33da6fdc439ee892146bb8c6dd9b7b0be97
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://plasy.com/uploads/file/53757116985.pdf In PDF document text
    • http://www.hgbehringer.de/img/files/files/duxuwutiwinutudebig.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/juxanedeguxasibowizu.pdfIn PDF document text
    • https://clove7.com/userfiles/file/3327743442.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/33995679705.pdfIn PDF document text
    • https://kratky.eu/files/file/vamopix.pdfIn PDF document text
    • https://megashina24.ru/files/files/solivikadezek.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/1677d3d9e77c93e45335e030a0f9cf9c/92746004081.pdfIn PDF document text
    • http://webbuilders.com/files/file/34746890206.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/4935352003.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/lanoka.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/64062001354.pdfIn PDF document text
    • https://actor-conseil.com/files/file/8964058369.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/23355668493.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/51301411369.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/89566593867.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/slmq0hqtlcdqcu0ubgpk2fboh2/luruzenajisugewan.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/39134089329.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ca4ccaf05---41295099453.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/razuzivitijejo.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/bereleruzerawuzof.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141106fae45f---miguwibidotoveposob.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/nokikifinepuxidixu.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/11/diven.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a0f01ea29b5e981f147e0182be33beab/rejetagitogisolukulixoboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=modern+house+bloxburg+20kPDF 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_off0000b61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61D 16728 bytes
SHA-256: 538cf26adea4275c4e515f99543313ddc5e1aae7d153d09d17e5066f3d616a0e
font_01_sfnt_off0000e035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE035 10844 bytes
SHA-256: 202ef78a8a3a9109badafe7481754490c5651c348cf279f4b8874d540a39b9a8
font_02_sfnt_off0000f8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1