Malicious PDF — malware analysis report

Static analysis result for SHA-256 333b99f9c7b49d21…

MALICIOUS

PDF

94.3 KB Created: 2021-06-27 20:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 968723a896fd41622ca448098ebc0673 SHA-1: f95e1a4a99fb314b051cf388394131aed7bda482 SHA-256: 333b99f9c7b49d211207cca7ee10f454954747f8da0359e04524c5f0ef01965c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to phish or redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4p61f87fh2poaec31kk58afa75/86520406600.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa1c7bd9db---rudisisesiforujilezexali.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c2a8bdaa8---19750906637.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070976776b70---giwelovekazuzamibef.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/5645640c64b1b3826e42c84ef55adc95/talubapemudixe.pdf
    • https://nepalonetours.com/userfiles/files/59671396872.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160845ddf8712e---74632885306.pdf
    • http://alpha-cp.com/userfiles/file/7932843518.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/09555ce84b6ba93d8776264727e69170/51866487450.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/98vmjurp9msikbo8d354l6se50/49559049842.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/22030543485.pdf
    • https://loyallcanada.ca/editor_files/file/20913531591.pdf
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/24497136658.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ig5jcftf6n4a7e66n0iimrssi0/93266764556.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/e5b472160a11840e5ef604c9e1c2f1c7/posezanunodovipaf.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/77b0cc4233ad9d14d1c6ee17adbdfa71/55341589808.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc00b00415---rijoletomefegoleriro.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160841b21bebc1---luzozibemiwavijitizo.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/a1bkc4q96udt235uotfsnhs0t0/susunaxafuvilaxaligojiwez.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16097867e3f119---fajogawevuwagotexidefa.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/8t7hos08ds404t30glo3hpv724/49206800320.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef35504bcb---xemikina.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec935b8a7---pabikukivijoluwizitofop.pdf
    • http://abwlanham.com/uploads/files/laxunifaje.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/doxivunobiwifobeziwavegi.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/34d3e7267f998e80f82e00f881577ce2/venurifezatofususaxegiga.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=career+objective+for+call+center+agent+without+experience
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010afd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFD 16792 bytes
font_01_sfnt_off00012314.bin
865f98771ee2766447b683ef9362d19e864747411cbefaa3f1687bd2a70d846a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12314 11248 bytes
font_02_sfnt_off00013d37.bin
898b1f08014ac00458faf5f86316d3daca1c015d5fb1dba95d38ae4d91777873		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D37 17564 bytes

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