Malicious PDF — malware analysis report

Static analysis result for SHA-256 078b4f5315548fcd…

MALICIOUS

PDF

88.2 KB Created: 2021-09-16 14:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d2525ed54128f99f6c2d6a3aaf02885d SHA-1: 207318d8daf185a7bc205fe35b65324adb9f96ee SHA-256: 078b4f5315548fcdeae8696ae39ef0470cd9060a8f2d08bce98c85e3fb5dc09e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm on disposable hosting, with multiple URLs pointing to PDF files, likely intended to trick users into downloading a game. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the structure and embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kleinschadenexperte.com/userfiles/file/25167291727.pdf In PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/verenakidowizubizo.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/85463182719.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/dotadareludapujugar.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/zositudebidizefasenagudo.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/wixibuvizopepitodobogu.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210909/file/busovazilo.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/75630788780.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/vonofajisezalopulozu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135118a201c3---66782514262.pdfIn PDF document text
    • https://everestart.com/images/stories/file/gezawud.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/nakosagunovidibefiwik.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/waziwugiwin.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/379578fdb41c9f8a3fc02a0b763cedb5/xenonamovabu.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/49327206345.pdfIn PDF document text
    • https://citytrafik.nu/images/file/73024900033.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/79579795262.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/hl2cdfsc8858s1a2sjivg0b7sb/mesavajopinepurepowu.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/16951772089.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/31888112173.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/37015193139.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/14e0e65dfa9f7a343daf371d8bdb758e.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/54881318553.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/sonajuzebazevokazibek.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/56684419396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=gun+game+free+download+for+pcPDF 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_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 18064 bytes
SHA-256: bf4068e19e061341fd1c376c431b659c93d8e240845e4c98f24808304e1b4f56
font_01_sfnt_off00012238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12238 10828 bytes
SHA-256: 1e610777780372122e9a88a1fe4023ea5bf41276a5d9ab1809341fec350b0a78
font_02_sfnt_off00013b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1