Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1b05c03114cc4d…

MALICIOUS

PDF

88.4 KB Created: 2021-09-04 21:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7ca650bdb83787409ce44c693925129d SHA-1: 991d22261c6e168143ed50e3c6377a1273b45c7a SHA-256: ed1b05c03114cc4d061f1b606a475e2b8fcc6a260ccbcfecd4f97a107f13ef48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. These links likely serve as a lure to download further malicious content or redirect to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://oniceh.ru/uplcv?utm_term=butterball+turkey+fryer+xl+owners+manual PDF link annotation
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/aed911c3c12c28463689eeae3e597ca7/kakijemotukalasugexizup.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16087d1bf444c0---10275486911.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/fasipaloledagex.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e10ea74acd8---67332320731.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a89c3578fcb---wumiberagilufaxufurosixo.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/2944977850.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/24504888666.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/54c8196b22bedac45c9011245d4591eb/jagalevatozore.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fba45ae1d---sedafativovede.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/fabazemonizojubikula.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/26526451654.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/zasugubujafere.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/87526593085.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6b374a2b3187b105c6c72615626e05b0/xamamatasazew.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070ceedaa35e---89130458289.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/edhtqgca10pbbt0llq7vje28v6/53856025859.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/68592323904.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/4334789822.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/ruzogikoxurelugidu.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/fofofujulajizivelu.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/zofinirojafunujivexe.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d3bf4ca90---bawivo.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/3782068992.pdfIn PDF document text
    • http://df-foundry.net/d/files/vupopavul.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fejerixubexijuxiked.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/34175155196.pdfIn PDF document text
    • 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_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 17984 bytes
SHA-256: 040f78f98cc87eb9f3f691f5f752b6570887a3c367b26bde51ab8e1d0bad9e7f
font_01_sfnt_off000121b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B5 10968 bytes
SHA-256: ae60348ac2ab3f6c40e6901f6265bdd921a678ff1f9eefc839ba8ee63e34e8b8
font_02_sfnt_off00013b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1