Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19b0eced56ec33c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-08 17:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 35d36386bb8ace743be00070c94458b7 SHA-1: e0ef32af838dfde8a90e115fe298d22dab278775 SHA-256: d19b0eced56ec33c4406ed6d30f578631c43bcd30bf6c26b6b1cbe79867ca0bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://coretry.ru/uplcv?utm_term=merge+two+pages+documents+into+one+pdf PDF link annotation
    • https://nordavril.com/userfiles/file/fogapiwafiguzo.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/gizunigukapawavoji.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/bofokuvubesiv.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/28955719365.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/23103509877.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/99141376398.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/totilobibusibijojokiwilo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613683b97146c---xusebutubanudibitu.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/8589006492.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/tunajorogezutuniletefad.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/a65144a690a431adfeaa08b0f09e15a7/1550887729.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/vegugolo.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/rimana.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/meresifawa.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/30617999153.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/kuvulopazomukud.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/50077186261.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/goxalutez.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161351ae5bece8---41615195470.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/58610875613.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/nepeputaseboxetokedoto.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/sasorukobor.pdfIn PDF document text
    • https://stormester.no/files/file/36585072527.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_off0000d4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 17124 bytes
SHA-256: 519eb6849d7d66159276c3b0d550e64344996ef580b08c311eaedadb4ac85f20
font_02_sfnt_off000119bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BC 11096 bytes
SHA-256: da095632fb785ec3c11e79f6ee2e98cc96372f3809fb4ee6f97ec237df495547