Malicious PDF — malware analysis report

Static analysis result for SHA-256 404e6daca34dcbe3…

MALICIOUS

PDF

74.5 KB Created: 2021-09-01 04:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d6c7ebd452cf350d4192d4f3b9f0d02b SHA-1: 19c72574bcba39156ab47f5f374e7c676dbe35ca SHA-256: 404e6daca34dcbe3ccb13a047c65f18d6f20902b6ac7169d612aa7aca993587a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cructi.ru/uplcv?utm_term=direct+joint+and+inverse+variation+worksheet PDF link annotation
    • http://ri-rm.ru/userfiles/file/jirolapatebowujeb.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b783de324bb---morarubigunekipozobese.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/88097715070.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/pugupetedebi.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/54881035794.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/rmmlir5iv7ucvjmbduqh5p178q/39633673893.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/075670e6fe602a92b355c7574f0f0ebe/misowinupofugugaxuwarifed.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/35496190313.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/te6iq1pm5lhj47an17noesg5e4/xeriwamowolikiju.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/juwamoledesamotoxudo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/fafefonofutikalum.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/8a21bfeb8e53d1e8886a2a5beb069e96/85670099461.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/gowisaruteju.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/otsshe73cu86hds402dobi1l63/fewewepawexukufom.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/divadobedoxubaxodipuwi.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/0tch7jnve2n8j81ieou5mkd1pm/masekewilanulolabomizoket.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b9b82c912759492328b7bd64c444d277/5290548379.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/afc499b23d017e54daf0fafed5414245/76488531071.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/944182570.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/rugexeregojudarivur.pdfIn PDF document text
    • http://mesterek.net/tmp/rowodizevatedo.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/65b2d9f101edd3fddf2cc6c9f4dc51bf/73281060770.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9ff303897---47001105168.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/mulotowuluko.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/3667d38979bcbd4fcb1113cdfe063dc1/6592624007.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/gn3hn1aod8l3je0af1anms90c5/teziwofazabekidemadejude.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf3add466e---tuxipozibikagovevo.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_off0000c41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41E 15064 bytes
SHA-256: c5b41f9d11bffdc456b6b969073b6f9b160a1e605e237f05135dfbeda71b647c
font_01_sfnt_off0000ea66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA66 10796 bytes
SHA-256: 738c123b977288594e803dab70929c4a3ce8a20e65d1504c270bfcf62df6d772
font_02_sfnt_off0001034b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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