Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d49b3abf5eacea…

MALICIOUS

PDF

74.6 KB Created: 2021-09-20 02:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be83a3b34684ab254dd6b31f4b51f37f SHA-1: 93ac08e448a28ca44516b0e887e2bac16054d4a4 SHA-256: 50d49b3abf5eacea956281e26d474fb2f13b7ebb0027a36399a37a84f6f6feaa
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These sites, in turn, host other PDF documents, suggesting a multi-stage distribution or phishing campaign. The presence of multiple compromised CMS upload links further supports this. No scripts were extracted, and the document body was unreadable, but the link farm structure is a common tactic for distributing malware or leading users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=chrome+browser+cast+to+tv PDF link annotation
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/uhm3lqvpcadvev8800it2sp4p7/rikafefara.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/dudanati.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/uclcu3akqvt0sp9ft234fvn131/9784123408.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/78211590937.pdfIn PDF document text
    • http://aa-nusd.jp/vajoreb.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210903130452932.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/51867610699.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130401f98a41---85473204239.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/a2fefbadb2c9b3e399a18941c7495b10/magajobamoxepapo.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614700958c8d0---jutizemiwobaxeninuge.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/55719956732.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/15802235507.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/lolufowizu.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384add93c1f---limegasi.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/69766120365.pdfIn PDF document text
    • http://calisnt.com/uploads/files/waxagarovurinonelad.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/82368771775.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/10564816686.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/47741514350.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/varibijigot.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/92563001646.pdfIn PDF document text
    • http://geotersrl.it/file/39241703725.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94395117095.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/feef380c6ee353dfe5d93c83fa7d878e/zugotoxolukaga.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_off0000c06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06E 10576 bytes
SHA-256: ab7366d64fde30173bb13aba6ce569242e024865fb364103d60db5284c096b49
font_01_sfnt_off0000d8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B9 17032 bytes
SHA-256: 35ffed68e8c43cfe3bab503982c60b98bd260099fde4571107a268a44511f3c3
font_02_sfnt_off000104fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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