Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bde1603cdefe52e…

MALICIOUS

PDF

74.9 KB Created: 2021-09-06 09:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 070603d277974c44ed8df106cb33d91f SHA-1: 13a19e15a32dd1a304aed5a9609457717fa11673 SHA-256: 9bde1603cdefe52ef547349163248c903a428da4b43fcf4bd57b1c9e08954b5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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
  • 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://wakesup.org/userfiles/file/58384683878.pdf In PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/jalekot.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/51765533278.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/rauvvhgfkgkbe7lq88h4k64o4c/navazoxeduwixa.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/62065185508.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1612720c170594---36695584317.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16081119618819---85475624204.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/dixigejoso.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/fuxorokekolegu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800db9b97e3---96140292631.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/62389962891.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/rexosafalosipumisitowed.pdfIn PDF document text
    • http://maksimetall.ru/files/lavizosiraborumikede.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/mukobovinunum.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/28247202879.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/7b792e2abeaab7f41fb4de8dedf8ecf3/64960242505.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/76775653974.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/7650007394.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/gh007j9u8ml7f5gp9jgeaof044/resibigujadisejeviler.pdfIn PDF document text
    • http://vitrine-prof.com/files/23061460845.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/70536089539.pdfIn PDF document text
    • https://ebooksweb.net/files/file/61683149968.pdfIn PDF document text
    • http://taociren.com/upload/file/210808122903765627f09irjajzhot.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608000aaecc04---zobav.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e59d1d3d3d66269c6e8583bcdaae4d92/98704790762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=auditoria+fiscal+libro+pdfPDF 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_off0000bfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEB 10600 bytes
SHA-256: fd9c52e988a5fd0470f0c0c11f211193b576dbe7e65b389414f88a0ff4c20474
font_01_sfnt_off0000d80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 17508 bytes
SHA-256: 439e76123aeb4146f0093360ce51c78b91a171ff4c32f38355a5a70f65afce02
font_02_sfnt_off000105db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1