Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d8b13f94ea751c…

MALICIOUS

PDF

83.8 KB Created: 2021-06-29 22:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0340d63da3b493970a6b93136e43327d SHA-1: 7570560183224e6d76c2b826d6914aeb023db161 SHA-256: 08d8b13f94ea751c7bcfab0a94cfb602552bdd444bcd3f858cd97be967fc1d59
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these compromised sites, which are often used for phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/051a91c3423d32730feb37ac1882b11b/ruluragonebavunidofu.pdf In PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/f36c2966f74b7cb588edf5c3ff212c2e/maxapokuduwo.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608213314b6aa---91178472779.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/92570570122.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/76681950441.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/b3eamqk28nbljgu872i30q2pma/nevodaveragaxivisopip.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/96916992891.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/15758767835.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/6l21oqh5mucbsd630ggmcag62e/sojawopuzofilosufovelapa.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/78378116697.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/dbraq6p6093gkooq9fk388cpvo/36832091517.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bee05e9ab---zatujeperume.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092526987fcb---nulamiwokarovodakonopobu.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607742f429abd---xuridifuwomeno.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/9d7ed2ecac2cdd36a3c6e64570a6f16e/damovi.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28e118d7d---dovutuzuwux.pdfIn PDF document text
    • http://rc-modeller.se/images/file///sugakowelel.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/99752869095.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07590c42cf---xaxolomegakalewejurub.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6ec63723---35081891819.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/werudidaporakoxo.pdfIn PDF document text
    • http://wohingltd.com/userfiles/saxoduwakegakikuzekivupaf.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/59688617616.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/10597233216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=shaw+university+libraryPDF 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_off0000d890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD890 17412 bytes
SHA-256: 92b1102d1d318a4bfeac6a4e17ca1bc4e3c9ba667aef2dab833afc9ba323917f
font_01_sfnt_off000105ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FF 10664 bytes
SHA-256: f3d01732f90aa811f9791168e372b5b0567d90e69d98eb316b8b1873fa0651fe
font_02_sfnt_off00011e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6C 2600 bytes
SHA-256: bd516add5ed66fb1cef3e8833f8dc95a55c3a646de538e30e95769ae85466dc9
font_03_sfnt_off00012987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12987 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1