Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3a1679027e06b7…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 11:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea468910b882e622b93ec7248216e089 SHA-1: 67d34cfda09092b1d5fd09118aa370ff96771fb9 SHA-256: fb3a1679027e06b712cf48418e23fa8702f61fe88d3df4a18905027beb600c8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites, likely to distribute phishing content or for SEO manipulation. The embedded URLs suggest a phishing or scamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a19a17cf453---85541567167.pdf In PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/cce98adea76e1e9bf4b282c2bcb96f8a/vasakizujakuvetebep.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/93159ecd6eaab102371c60325c9cdca0/dudijep.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fefe7db0c0---15876313517.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b51ac62a256---95335942108.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608099b2de53c---64589361349.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/n2qglsp23j2hj70mpb4qnm62i7/govepuludafizo.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/1585066108.pdfIn PDF document text
    • http://belst.by/upload/file/17404998013.pdfIn PDF document text
    • http://art-ball.net/files/file/33114300693.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/dfc8dce9adca47a8ab7779b25c98ec6e/gezibi.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/10c774379f2f63f5db8ee0bba04cf7bc/manikopovaxa.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123cdc458ad3---47328842559.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/xigaxol.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/2ml0c3j8tna670fupt5q0juldv/wesodinaluxefuxow.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/82989792844.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ihgk771s9op2cnlf44ur73k206/39886070139.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/fc33adfc1c41ad2d120c395693f2123a/53914630899.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c56769953e8---61497960770.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8368c81bfd---ruxebamapukemuwezenunar.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd43ae24bb---93064544173.pdfIn PDF document text
    • http://195exim.com/datas/files/rojulezifej.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/fakoluxikedimixabato.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/kufovikipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=estados+financieros+basicos+ejemplos+pdfPDF 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_off0000db2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2C 11032 bytes
SHA-256: 16de370707de3fb27e1ad4ccaf243b09b7d67678ade87ee34835278d76308a36
font_01_sfnt_off0000f484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 17936 bytes
SHA-256: aa91d073486610c707730dc430a93a8de750294425bc7d159e38b09aefefd967
font_02_sfnt_off000121cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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