Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13fa58a7e6c85ef…

MALICIOUS

PDF

88.7 KB Created: 2021-09-15 11:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 031ea78f195bd3e8070abdcaba26c896 SHA-1: 14ab74697fb5c9e98234ed8e4bfd5539b30780da SHA-256: d13fa58a7e6c85efa04e37efd56a3069f218c3f3fece018857c0a68fcac5c27b
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a signature indicating it is a phishing trojan. Static analysis reveals the PDF contains a large number of external links, many hosted on disposable domains or compromised CMS uploads, characteristic of a link farm used to distribute malicious content or phish users. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3961

Heuristics 5

  • 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
  • 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://huntic.ru/uplcv?utm_term=obb+file+for+android PDF link annotation
    • http://nemeckystrakac.sk/editor_uploads/files/povarawefon.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/76615597540.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/31e38888d7ca9078efcaf8907b4a5ede/23103618199.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210904060525.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/91047818274.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/12450307405.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210901_718EE5D5E84ECAB9.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/5490185571.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/37974955497.pdfIn PDF document text
    • http://smogy.ru/files/files/bupex.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/90718767501.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/12679333327.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/zalowegutoxodukitovaronax.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/tudafikera.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/53659875973.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/92341159623.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/87319467215.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b263870ec9---59389157306.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161354954b9640---runazamudo.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/dixivajovetazosopuja.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/zikuwifurejiwejanapevi.pdfIn PDF document text
    • http://besteva.com/upload/files/pagiwisivisijofetumema.pdfIn PDF document text
    • https://gdaniec.com/upload/files/xozul.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BE 18864 bytes
SHA-256: 71a733e161468449972094bddc3ec711469ee9ec00bce8948798b8d9ddc27727
font_01_sfnt_off000149d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D9 10244 bytes
SHA-256: d9ca46df069aa3efb7ad8a3179e479cc533528f4553c8cb1e930a6af443460cd