Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b2f8195c23ab99…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 13:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9b363e5ab7a4f7f12df874c2b1a80f8e SHA-1: af6d66200ae5e3c4e9dba7429665e39a83b81dc4 SHA-256: 28b2f8195c23ab99053bdb6fab87d9ff906c345b74a8abd1207d83ee32fb61c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=intersection+syndrome+exercises+pdf PDF link annotation
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/261c4c4e26eb34920293f38719260f34/51321576805.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/79852799704.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc80b2cc47---95005518814.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/denazelamu.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ec0a26525---89520384658.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/gtam330qkt33hbs7ulvpkfphsm/zivazosa.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161008c1515a94---fepoxulekip.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/36403957156.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202108031258059621.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160edaaba16c1f---jotewa.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160767dbc29aa1---fagaxigozatizakolugame.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/bejogexoveralizaxuzulepir.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/d0f39132e047afb650196546fe67d843/visodifusoxar.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/2eac91279de5f4d6dc9a00baf44adfd2/nofexuvadesiregoz.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/84953439083.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/vasoretugixuri.pdfIn PDF document text
    • https://ferropula.hr/files/52663829574.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/sosunutufimiwowewav.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161293508949f0---lavunokabini.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/nututupejurejot.pdfIn PDF document text
    • https://bselink.com/userfiles/file/98899063680.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/52571950775.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_off0000e540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD52 17924 bytes
SHA-256: ff6a74e04c7afb1dff491d5c40285c40f47c21da580f133fbc6b931241bd4b9d
font_02_sfnt_off00012b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B96 10740 bytes
SHA-256: 7e18de76f0a875ff4547d80b3598e8ddbf0998ac71ea5739c7ca962599de3e17

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