Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec8cad5dcf8fa14…

MALICIOUS

PDF

101.6 KB Created: 2021-08-07 11:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 74fde9d3d816ee3ec26f1a98a123bc34 SHA-1: 55af93465cff9b92a0f7e499790aa4b3132a155e SHA-256: cec8cad5dcf8fa14dcddf473d4a1c73cca16e64d692a62667ea7e9a62877fd52
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised or disposable hosting domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing campaigns that leverage link farms to redirect users to malicious content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e2dc859a2---12678135592.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed5d200769---gitibaj.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/b16d06e7b35b99ca4c32cbcddb4b9a6f/wejevigiwuzurinupu.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0a648f92---94220072016.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/51941154348.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/69957315322.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/dabedalejunewomosi.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/dikajif.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/nezeritatubiz.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/7bt0fn1mki9lrfj7ia7cf0qj0r/80713726974.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/g3hdeb422mfdtjlg4a3merrf25/95103072506.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/fd7e83d2bf5e97810b66a2c6f9ff327f/88675190527.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/nutunarakibopuroto.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/77490771733.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/xefasodokajaviko.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/c20d7frlcamecj5s5obqe13jiv/vogipavoxibo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7c7ed1ef46dffd37bdac9183977ed895/zuniborumikosebeto.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cac9c604e46---vamibuximitibupuvudek.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/jb8mi10iba34mmmcunjk5qcrcd/95580810457.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e50bf64af7---ronujesukiruvibedizeti.pdfIn PDF document text
    • http://skupka23.ru/upload/m/navago.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/jopewegeleb.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b929122d545---4678189471.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/2f271d6e4a13c8e640b2ac6bd4f074e8/mokewiwinumevaleweratevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+crucible+act+1+discussion%2Fstudy+questionsPDF 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_off00012875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12875 16936 bytes
SHA-256: fd131118a1b9f9fc92e38aa280d7a8b1c3c51130669745b945a41b2d10323f2b
font_01_sfnt_off0001548a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1548A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CA1 11016 bytes
SHA-256: bc5685cf6b59ab2fd335515cf1c3b3a6df18cdb156960e784546e4e6fc701b3c

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