Malicious PDF — malware analysis report

Static analysis result for SHA-256 f242731970a2b43b…

MALICIOUS

PDF

81.7 KB Created: 2021-08-17 02:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0a31b3027d69c439aab005c4f07dd40e SHA-1: d41b4f71ab6a2fe7030d07ce3b9cbc8a3a079318 SHA-256: f242731970a2b43b9e0c551af4ac863547af58d27584bae0052f5bb6ae29daf7
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading a secondary payload via the link farm. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or to dynamically load content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://daindnc.com/fckeditor/userfiles/file/sipesomanulezo.pdf In PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a191ceb04---xewosapipagujudozi.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcb5fb2f14---93599463052.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/26523984533.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160829f1d08f82---51969658452.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/sugen.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/vh82rlrtrqb36jbu3vbhp77k3d/bikejivowavulupobegejufu.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/68458419029.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a227ffca798---wofidizepuderisev.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075e373dfe1b---fojoge.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/likowepiforokamewozoxif.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d20294776---81424190698.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/7712c133211106eef468108ca4aaca7d/72943841789.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/mevulig.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/2239542270.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/recn1crgc60ngmlel88j1rvn92/tubejilibizutetetof.pdfIn PDF document text
    • http://popmetre.com/news/files/zikoje.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210708_DE1DBEC22BA10E7C.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/dotuxuge.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/92286001236.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/05ad2363dcbe5e0f4b361797567240f5/dakuvazutosev.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/nipuvavadinojefasubejin.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/tepawininepovon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=arihant+english+grammar+book+for+competitive+exams+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_off0000d6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 17228 bytes
SHA-256: 5b5bad58d5693853e39e4adfe946305da39646f869eb6fc633cf7f311ff8debe
font_01_sfnt_off00010416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 11448 bytes
SHA-256: 3950a8ce44e1a886b70d7167d6bcf79b9106628f9f3ab271e6cbba1be90a8f55
font_02_sfnt_off00011e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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