Malicious PDF — malware analysis report

Static analysis result for SHA-256 018cf1a8616daf34…

MALICIOUS

PDF

84.6 KB Created: 2021-07-20 16:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3f2886510bf09b871765a474f188d309 SHA-1: c2c8e1e8cd1c93808a05ad93ff5959f87546c815 SHA-256: 018cf1a8616daf3473d1590b78d78ab1a840cc745b5a35e7a2f7e52b7bb60259
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://contactconfiance.com/files/files/57692581709.pdf In PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e21c835b38d1a0dfed8f83cd0d032156/66971668286.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/10652669459.pdfIn PDF document text
    • https://usdcp.jp/user_data/userfiles/files/6574569898.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/1371801541.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210605_C1A93F6A4012FDB4.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/xuxinutuvugekonudib.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/lonum.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/xusarotemepekoxase.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5428e3b4b4---81968490812.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d025467998---wokevesovusogodosilosib.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/agjg5hsbr7h0sgeeur46jfjq6a/81637050576.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/mlu3h268a23964p6lh7lia0nij/zexofoxananivomojavo.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/cuqp3a7kplna2rp41b3jql6foj/wimewogebez.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/d61775960260109d19e60013c588998e/tawefuwufugefiwasoridaxaf.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/wuripetelowifiniwudopino.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eggp3kg7gch6a13mdeg6nn2sa5/jenovi.pdfIn PDF document text
    • http://chongros.com/userData/board/file/97785485111.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/sovesetivirutev.pdfIn PDF document text
    • http://grabnerestriche.at/lozikuvufubisejidazeg.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5768e47a0---wusebob.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210714_FB33F944F3F79A9B.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/e848bd9d3b249c63388bb5864b472b17/ruvemufikeperazafudazetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+check+recently+deleted+messages+on+instagramPDF 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_off0000e6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 11100 bytes
SHA-256: 73651bce8ef1c325d32a98224869ce8b1227bb10717fd0d6b01654b680b05a3c
font_01_sfnt_off00010050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11862 17028 bytes
SHA-256: ab1ba481c50b810b0f5c527ef777ea5163de1139d6071544673d6651c6d2491a