Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea67639a738d8c2…

MALICIOUS

PDF

114.4 KB Created: 2021-07-19 15:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef39574dc7e4353ef576989218ee49fe SHA-1: bfbe2fd61bc27b3f164f53a91ab3631662203100 SHA-256: cea67639a738d8c2cfb468bf2caa049090871b744074ba8aa08be207fd120964
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609accee416f6---nosojobetagiteritenaxemo.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/8ecf5598fceea4ccd269a4295924f9a2/26988410330.pdfIn PDF document text
    • http://fittbikese.hu/files/file/24613235047.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086660159321---43107524261.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/40584450267.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/wiruwe.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/87fos260fkae5fs2hn23o309p6/86541501464.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e6f7f33b2d8415a80fd03b01e9097ae5/41073171803.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/cm668j5tavn5fjmuvoa9ro2i70/24434091724.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/97400406331.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/rut340g08rqsltmaeesb7gu8ie/tekejubabadazadivagolevu.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/90316225019.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/zilivobiga.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c96616cfc---vodezuwowesib.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/10634517093.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/6175911400.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/42277420002.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/12c2cc7655d073d7b4a57bce87ca2747/62420125741.pdfIn PDF document text
    • http://zivotzaokny.eu/res/file/16684392358.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/66292107673.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/23168163802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=word+painting+in+musicPDF 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_off00015e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E18 10772 bytes
SHA-256: ea0ff50b9db03e5dd414ef7280ea5a1e274daaa7845b72e0090e88d2e9c09cf5
font_01_sfnt_off000176ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176AD 17672 bytes
SHA-256: a1f6bb5151a96bdce2f12af4de1ed3c2ec25399f72b1d1a223e4246b3214c0e3
font_02_sfnt_off0001a4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1