Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0298a3b196d20e…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 21:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1221ed231b84620fdcad894bfd30f693 SHA-1: 269232b6cb90d00db37abe2f08af6c4220bc5b61 SHA-256: 5c0298a3b196d20e7d1144c91734f45bee360e4c79221a1277b166038be4b39a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicates maliciousness, and the heuristics point to the use of compromised CMS uploads and SEO manipulation for link farming. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's likely part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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://laborke.ru/uplcv?utm_term=hacker+ielts+reading+pdf PDF link annotation
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2fb561231---19069304582.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e689eda16c0---bosuvirepesarejunut.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/3a841519d3657ba7b0498f9762b4844b/sowaburer.pdfIn PDF document text
    • http://plncse.hu/php_data/file/2044948584.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/45473516823.pdfIn PDF document text
    • http://dzbnf.com/upload/file///60962005758.pdfIn PDF document text
    • http://esejsc.com/upload/files/xujeresusid.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/4629003962.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/52749340485.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aab3333f3b9---23995710081.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/76561255758.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/4von5ljiiigqa2c8k1v8k550r0/23622236132.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/2jbj0r70jtcfk636lk7as7r8c9/jagunur.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0181688b8---rurujabixob.pdfIn PDF document text
    • http://wohntraumgmbh.at/jolotunogob.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/pasixazajatuduzewijod.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32c8d6a8ba---36226899578.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/20988307460.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/latujifiwugudat.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/71187801952.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/38030550083.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/7b81ef86329d3baed15967caf69fd41b/22421578118.pdfIn PDF document text
    • http://cold.lt/userfiles/file/xikusexinexis.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/bakun.pdfIn PDF document text
    • https://landbar.com/upload/files/busoborupakejujejizubiwa.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_off0000cc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A0 10756 bytes
SHA-256: 548a1aa1c11029276fa152382328f5fbc6e299b42891d5c7ad856c5d0db9304b
font_02_sfnt_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 21020 bytes
SHA-256: ca8ccae78bb0a6c08561bbb9b283c209fa7e2c4562913d96c6b1d954004da487

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