Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4a8f0f086906c0…

MALICIOUS

PDF

68.1 KB Created: 2021-09-19 14:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6a1503cbb45da783684cdd38aaed6b0 SHA-1: 1f30489dfa4fb7c828e74549c6cd2bc33a2b8c34 SHA-256: 2a4a8f0f086906c03990a053560aace187393913958d79fc433162fca795087c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple domains, some of which appear to be compromised CMS uploads or disposable hosting. The URL parameters suggest a lure for game downloads, indicating a phishing or malware distribution attempt. ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3202

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://pistant.ru/uplcv?utm_term=free+survival+fire+battlegrounds+download+pc PDF link annotation
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210911_D0220571766B3ACC.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/54938265281.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gapowilamewowidavubivi.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/70859484224.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465a3fee0ea---88874202092.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/satupukefusagore.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/damazuvejolorugi.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/waduva.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/vurofomesozofikivefizejup.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/desumelevatam.pdfIn PDF document text
    • https://12tiga.com/contents/files/puwoxegavisev.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161439ca847cf9---jalojurex.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/luxijipidevurudivesofim.pdfIn PDF document text
    • http://ccsl.asia/files/19239585514.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1631402398.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a447580980---kadibokenalovur.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133beb813fc7---xegamexikaru.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/mivofozobom.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1631223879_b50ff0601e.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/keloxigi.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/sakesonebewufawezutol.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142fd02c524e---32642450018.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/zivowujamegonej.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1614059f0eb5d1---62685048157.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/pemafebabotilimi.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_off0000b382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB382 15640 bytes
SHA-256: be5e095a36abd4245dcbf47ce0c91a37dee9b5e71320886a7fb4c78a19cce019
font_01_sfnt_off0000dafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 11164 bytes
SHA-256: c6aae3755c11bc8161ec10e63d8de56cf8cdc5e89997599032cf29baee043ab7
font_02_sfnt_off0000f4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1