Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc6d2f863136a7e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 11:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 899a5468f50b13a4e3ce4e6ccb514544 SHA-1: 7368ad9239feae2397e20f7c51f89fce75a2460e SHA-256: 8cc6d2f863136a7e4676dd16e4c8d435a4c7364b54f2a441d2706df8626b2043
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://aildf.in/userfiles/file/pipojawi.pdf In PDF document text
    • https://pasifikendustriyel.com/userfiles/file/vazap.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/mobavutimuzabipazonux.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/32155541821.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/85652120085.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/1839770530.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/vaxajaj.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/70760186722.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/mugopagexeko.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/40742780067.pdfIn PDF document text
    • http://espokebar.com/uploads/files/57091667660.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368875543ed---zanatipufivedejadadew.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/da8248d5951f4ec03c9b6299c2c034a8/nawajukubebov.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/d7v6qs83lspp0rcagibp32884l/gojuvomikevimame.pdfIn PDF document text
    • https://artbynela.com/uploads/file/37914042048.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/91079301849.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/vatokila.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210908190225.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/90978590984.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d264c64205f71c5646243ebc18876ff5/12767685680.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d9fbb1710---pewijegizexafazoril.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/30919546256.pdfIn PDF document text
    • https://bloomeng.com/uploads/22041956529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=apk+rainbow+sixPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/72520895257.pdfIn PDF document text
    • 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_off0000d12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12C 19020 bytes
SHA-256: 144c2d6a99ec5d679ddff6c4965ab010f50430f1dfac968bc1bfd3532f8611cf
font_01_sfnt_off0001030a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030A 10372 bytes
SHA-256: 33140dbb0166e032f1fea73a726d8c2f0b30eafb2a86638bf326840ebadf8c3c
font_02_sfnt_off00011a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1