Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c896d8d5ff770a…

MALICIOUS

PDF

92.9 KB Created: 2021-09-15 17:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aec99443e2f5766ab7fb2b8feaaa6e6f SHA-1: ca2e8ab9bb064f35e06b44a306f1fe3f92d5de68 SHA-256: 86c896d8d5ff770aff78c9786ebfa708fbab094a80c2f349c228f4315ecf3659
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by ClamAV. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to various domains, including compromised WordPress sites and potentially disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malicious content. The use of multiple external links suggests an attempt to redirect the user to malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3270

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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=best+loadout+for+the+kar98 PDF link annotation
    • http://danieldesignpro.com/userfiles/82907873720.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/xiluzanakitivaz.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/liwudatabiwuz.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141398c9be02---97397416097.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/29687120163.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219141656467555.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16132eb5505765---rajumofolekawa.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/deraloxap.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/lewebologed.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/57643008925.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/vanetam.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364f97b8f54---82203047476.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/89007492581.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/vapopusaxonix.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14694008463.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/nekudedinaf.pdfIn PDF document text
    • http://gaudi.tw/upload/files/poxawizewugaziroxasarutuj.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/kibobupigulepazi.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/hlgcu54hm0v8jj9lhhrej2gpn8/78592807382.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/warejedirizasusanoxevaw.pdfIn PDF document text
    • http://trubaopt.ru/content/file/95490631348.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/felawenejaludej.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/88266654221.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/gonobujofudedodamo.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/pexijakazeduzolobaledizax.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/041726105627.pdfIn 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_off00010c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C78 19260 bytes
SHA-256: 8595d8d8ed576357e113a98e5ee0532537934489d265cc1ea1b9d5fa9ec6dce3
font_01_sfnt_off00013f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001573e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1573E 10876 bytes
SHA-256: c8c9d6d41e24fc3de27200de1b8dc7b1067f3406958547f9b9aa8b3f53ddc6f6