Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ebf415591f652c…

MALICIOUS

PDF

93.5 KB Created: 2021-09-03 13:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 35becdbcc2fb3cfdac233d4f23fe8b55 SHA-1: 664aa56ea6aaa43b51777d592650186b324f4cc0 SHA-256: d2ebf415591f652c86f2d6f2e82d08505aa95f60a110146c8499ab16a894597e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://retrolondontees.com/userfiles/file/96941528850.pdf In PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/82390969164.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/11688806471.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d358e0d4824---30090501588.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/164e44bbdc08420d3f699d8ca49fad50/xefubojig.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/jinagebazetujakom.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/c684d9d6c77db84524d25cce5957cc74/23533485780.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7705917a6---34515610535.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/89044449830.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f1b074aafc10890cc7f47befdc8008d5/dojuxobofotusoriradavafo.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/nanikuxolisesirunaji.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/36341092810.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff183597d---51443547215.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/zeruzebisunateze.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/75731778026.pdfIn PDF document text
    • http://bulmarconsult.com/files/70002132934.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/taluniwivawa.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079187e86f32---9708176634.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/taibnp2eh1cn2al5gjtgaujao3/2320267792.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/nanaginadebetex.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff693c7f53---tuzozudolagolijotakal.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706fd89f905---73250914659.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/de8a6917b72153307f81bdfe7e507113/82596213716.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/livirewes.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/puwejefasirikopele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=time+value+of+money+examples+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_off000107e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E9 18336 bytes
SHA-256: 117eab17125a0bd83794c1480d630876e294c43487d8d4eb908c1164695206c8
font_01_sfnt_off00013790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13790 10808 bytes
SHA-256: 498c73bee9ccde801361df4f0bb7c5c0fbb0a113f20fccf023df6236916d4935
font_02_sfnt_off0001507f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1507F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1