Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef80a5819f0b887d…

MALICIOUS

PDF

67.8 KB Created: 2021-09-25 05:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 378171f22b42b2220b425f8817f6ed31 SHA-1: 0a1501b81241636c4b46f552aeeb2b1b20bec29f SHA-256: ef80a5819f0b887d586497a407bdfc75eca7f38ae9135dc7072c624ee524487a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document functions as a link farm, likely to redirect users to malicious or phishing sites. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ketchas.ru/uplcv?utm_term=how+to+insert+video+in+pdf PDF link annotation
    • https://umartravel.com/files/nufewiwekakipakelu.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/58426106024.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/bupigarudigokodexufemolam.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/50570562994.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/kuxukutojenovadipovugaku.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af1d0d9e45---rapajitigezavorizubut.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/q26ogvupq13oom9qor4jk3o105/78990534830.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/49651751802.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161363a0c577af---21537863504.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/41641004530.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/61340cfea30a9.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/d7bc1a01bf58943c10f12176a806feb5/58391417142.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/15763916704.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/lagoturusomomode.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/60322212937.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109241233108702.pdfIn PDF document text
    • https://eguiders.com/uploads/47325574839.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/vusokinuxuzakuxoro.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/wiwazopakujedawagal.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161435ab34cffa---buxizif.pdfIn PDF document text
    • https://llc-sahara.com/site/files/85442078119.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109100751018245.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_off0000adb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB1 14608 bytes
SHA-256: ea1668b0da6821263e115d2fdc4b32a3f5d52b936d1fc27a8b5afa3b262e779f
font_01_sfnt_off0000d245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD245 10424 bytes
SHA-256: c6d0a39ffd7dfe0bc3a6fc71d1a3f146d85e6bc60d9df96437178ad878990e33
font_02_sfnt_off0000ea09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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