Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62359389de72513…

MALICIOUS

PDF

136.6 KB Created: 2021-06-28 11:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ba6d409162b6b1cd5d951d708fdedd6b SHA-1: 64fc0c2342a5f980ceb363535eb9fcc8882d77a7 SHA-256: e62359389de725137f38f8598b78c57cd3269ff759d77d1533143c16e8d9e26b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://topnotchimports.com/ckfinder/userfiles/files/gadamikunuj.pdf In PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/fabitib.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e4cd644b1---jevolumisubisusozemebat.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/3pvo0o5u5g8a0jrhmf461u2kd4/dudebisubuwejefeweji.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/wotubegavotisogatudafig.pdfIn PDF document text
    • https://afayl.com/userfiles/file/kidilemimi.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/777819407.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/wefesopi.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48a782b3f5---76809878927.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/83cfbdab178d3a5e5324f4866071f677/tuvetisabotopujanedesu.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/83da4c38b6efd38737033db48ac6732e/limafulamabilutidokizutas.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/31128447087.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16097cf3cc0802---felojux.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f7853b672---rotus.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c00629ddcd9---75732700886.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/9lg8k331tui4p9ejuhvq46snmh/45978544679.pdfIn PDF document text
    • https://isleo.com/i_photos/file/sisobalala.pdfIn PDF document text
    • https://scriptdd.com/_file/file/8152692944.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/31e2ca5eae5e805954d0fbe810f55776/zugoporipisizivijupo.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/2b5c63be938413a519dbf79d64865b2a/47748445118.pdfIn PDF document text
    • http://decaiyun.com/upload/file/21062303530071152455m76b9c2pgj.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/32176921148.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a3b138f8c---ranubotakuvusejofomedif.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ff62d1393c7558f99a2c60d851c25179/wederotabafo.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/lunowokigaxodozotifes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=methods+and+techniques+used+in+teaching+literature+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_off0001b2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2C2 18812 bytes
SHA-256: 6d9912b09b02ea80018a6fc33c0fae1ea56b9604745c3ee6d1d3be0ac8d32636
font_01_sfnt_off0001e365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E365 11140 bytes
SHA-256: 81b0a60b135741efd1ed51f47761d65b3e98d5636e4fa81b6738c6eacda9d604
font_02_sfnt_off0001fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1