Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe7b648f0536d21…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 17:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c61505399b5818dacb14a6e2f951d8ad SHA-1: 980426827b77415aa67ae81234bdc00e3537c3ab SHA-256: cbe7b648f0536d2150e608acd2090000f8924925c4223e3a38b5d245fceace7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These URLs are likely used to host phishing pages or further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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=flory+huggins+theory+pdf PDF link annotation
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083dde873542---jezarotubonixezodulupurob.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/xobuxuvitoguzupuxagedika.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/60024786556.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/tolisezolusibefekuj.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/58030187269.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/p59jqdlk5ppel9skvem1kj6k75/gimiremozaworolojiwifa.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/geq3e7f6f4vvjv97jg9938sef0/40480755223.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/kel3208c2nf5nd2n96sscif075/wuwepepojajepanitanexe.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/82178656.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/fonewopawu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e738d9665cf---80966636250.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/xepexefezevi.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071686a65869---14189606672.pdfIn PDF document text
    • http://ksmt.edu.np/assets/ckfinder/userfiles/files/bulasakufaberalomudepugo.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38023935656.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16073aa9025604---9921789376.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/bd5206c250c60161534a7d0579db8480/22166944675.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/madebanedavakuvefima.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/8493013775.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/liditaxowevixaje.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/risewavujatufepu.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/dizisazusijufozaga.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_off0000d32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32D 18492 bytes
SHA-256: ec724c417a86074f355b98d4d5dc55ec7686787498629f4a18a8d1c669574034
font_01_sfnt_off00010377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 10808 bytes
SHA-256: 17196d75e108aaa74da103630e0000b0a51f918d067d1079f8138d2277a7711d
font_02_sfnt_off00011c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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