Malicious PDF — malware analysis report

Static analysis result for SHA-256 215003c5ef18c6a2…

MALICIOUS

PDF

82.3 KB Created: 2021-08-20 22:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0489a39dafa8dfb7b2f41d80940004a4 SHA-1: 93665f88c53d08a5107d3222da0765ecb2b80563 SHA-256: 215003c5ef18c6a2c371a52302eb73f6cb7847143f89af4a0a029c66352828d8
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bb39970235---dewinotutirulagijozumijar.pdf In PDF document text
    • https://kaptenhoki.info/contents//files/tajegagizakiketidona.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/21664974958.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/vorubukefawetutumuton.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210612194827.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8e10c22e0---fowisuferozodez.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/tinuwiv.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/22124968266.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/45373607648.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9463e6d9604a2909911bb37ca7a6b86/xunevirawuwawegonu.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/89417269220.pdfIn PDF document text
    • https://isleo.com/i_photos/file/2243421377.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607525f71aa9c---juwamizenolet.pdfIn PDF document text
    • http://geraldkleinlaw.com/ckfinder/userfiles/files/jefedesinuzolelogapolaki.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f2d50ee0f---28687395788.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/xutarejibekov.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608daca12b521---36298124051.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/zegigejisanulolav.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/nipelogeba.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210705061921.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/88729559838.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/nufofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+reset+mfc-l2700dwPDF 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_off0000de50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE50 10684 bytes
SHA-256: 86ae1c9f6a79c75839ea4c109934156f136cf656dec51d0e5419283bf3fc6c89
font_01_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 16852 bytes
SHA-256: 36499e53263ed37d4558e037516b3978ac506597d72d74b89fa112be728589b9
font_02_sfnt_off00012323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1