Malicious PDF — malware analysis report

Static analysis result for SHA-256 43050d991d1fb26a…

MALICIOUS

PDF

74.9 KB Created: 2021-09-04 14:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 760cc67abfc263a171d9bd091c4a33b1 SHA-1: 459f42f0a38fa53a3da0dc8fd0a2ffa4abf64a8c SHA-256: 43050d991d1fb26a6f7a65aaf996881616fa2c5f20bfeedaab31efb0db121419
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 0.9976

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://lso-msm.fr/userfiles/file/makoji.pdf In PDF document text
    • http://coinproject.com/userfiles/image/file/juwiwago.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/potederupemuzanikowowez.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/61gjicesiq4cgdq2ts1aac45tr/veresewogedefabaw.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/1103409858.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/vokebuvero.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/23242034417.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/46277779716.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/a605b97f1adb9a0fb3703d2659bda3a4/22849866434.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/25056735004.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/583cfc88a9215fc6b0d08f5cfdca38a9/fikepilenijim.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826839a003e---selamatipixepeti.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/335o0c68b18gfkf4tijhvnkj50/majexuluparovalademita.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/483db48e18a1c5d89231a661b5e92bed/7858739047.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/9cmi8a36ebhvemij0otjnouq2g/54452834301.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/muputorevurexorubebig.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/7176831515.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/xetopofesafudapojovagaf.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/77528508503.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/4648587925.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/482935065.pdfIn PDF document text
    • http://fsanaq.com/upload/file/2107291529357204532t5kym8j4rg3.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/digido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=parts+of+speech+worksheets+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_off0000c246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC246 16708 bytes
SHA-256: 5c78d5f70620f667662b1432b0ca0b98263750a54143c7ba3f83da9c49cde143
font_01_sfnt_off0000ed50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 10656 bytes
SHA-256: 542a514fa2a68a169692175a1e0f9fd3f6658e72a3a7b90c6f285059a42b97ed
font_02_sfnt_off00010600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1