Malicious PDF — malware analysis report

Static analysis result for SHA-256 477d747c0d135ea2…

MALICIOUS

PDF

91.4 KB Created: 2021-07-14 02:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 146cc74872459ab4afd4e2be378d2003 SHA-1: 13bcde2ca653ff846a9a6606969a1938647472bd SHA-256: 477d747c0d135ea23034ee3799d7a714cbe68e0af9de50449c990806e9c442b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via these links. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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.
  • 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://styliststudios.com/imagesTE/file/81108911116.pdf In PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/feluseliriv.pdfIn PDF document text
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/jomupum.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16210292209394.pdfIn PDF document text
    • https://energooptima.hu/upload/File/21091773083.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9d35b9a9---rutina.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/foxotowujokaforefupoweze.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/69a27a992cc18a5b79d6777e237da1dc/roduzemera.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/2841865042.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/3316471460.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a9610fa34---fafemivuwuropuvukuvevux.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/n1bbjp9b7e33fmeq9feri5pvkq/83930102355.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afe4a412b43---litafuj.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afb52d8eca---fifudepezuwivomabuzif.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/67299579519.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/79806107b628fa5f9909e5c80994400b/lejonepezilixunifakuzata.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/e004ab9b7c8d89ad669f54e8e35a44be/weziwosa.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/i26bggvvvqjk5sflcgjcg2cqku/kixuvasufipalonogumisib.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/suo5vfp3im3mv3j37g3so4k7b8/zetup.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/06d184f4ac2cc867bdf5230bcae90dfe/40050039440.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/d50c5fsicln55lrb6ppjtbia5h/makozazufemelegexaw.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5a24cce542e527ef478c24c568f8d219/fokop.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16225158685177.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dcac1c618---rubumigilap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+make+a+bed+in+terrariaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10635 16176 bytes
SHA-256: 88ad93e3e248d384a7d1bbbcb97d0fa661b191d0ff29e658657573e9a10af748
font_02_sfnt_off00011bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCC 17052 bytes
SHA-256: 746304add473ef7f71bc125f64499fb21eed5a90f535ccc54ed32e48441640dd
font_03_sfnt_off0001480c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480C 10504 bytes
SHA-256: 8b1d40ca507ec8e464546fe8c4351ae5480558a6811d102fb56aba5faf6756ce

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