Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca4463e288ca542…

MALICIOUS

PDF

76.2 KB Created: 2021-09-03 03:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9f24557656f2e344efdd2749b6801d11 SHA-1: fca5a8cec9478eae474342c61578d3150090278b SHA-256: 0ca4463e288ca54278388af719272089f8da21b6d22d9f159413931af21a4b1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the structure and URL targets indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7781

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.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16103d20e3b1fa---332520848.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612890913d891---tawojevenojilide.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/68769035770.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/denipijonoxuxowigopa.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9004cff0e---xalefuwarupunewesanurinov.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/52622881606.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/85431586988.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/81053494061.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/1424822516.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/fosorozaxogevupena.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/sigikekevimozeteboxaxureg.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c206e33d068---binapajexokodox.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/tekil.pdfIn PDF document text
    • http://canvangdientu.com/images/file/vibelemoxajamitiguzow.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/dosulasagulexoz.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/60332244242.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/77045515195.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/5731c80d4bed9b636ae755ed9a627296/34913945357.pdfIn PDF document text
    • http://ore-processing.ru/d/files/43791256546.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/787e39558a91837344ebac8d12283b15/surofulofegivep.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160e09d67197bf---72340177996.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/48510893555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=regular+and+irregular+verbs+worksheets+grade+5PDF link annotation
    • 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_off0000cdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC8 11188 bytes
SHA-256: 91ce8a47cb71ca64fc15496d5c62f394c0bf5e5c9fdb3a6619fea889513b74de
font_01_sfnt_off0000e7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C7 16996 bytes
SHA-256: 4fbb7ed298eb75b760bf56c8347d3252cf80c16aceefb4d8ae54179984d2e2e1
font_02_sfnt_off00011419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1