Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d181e0124ea4732…

MALICIOUS

PDF

70.1 KB Created: 2021-09-10 17:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17da471c29725d719bd73944d6dc6233 SHA-1: 87a33954d2bafd337c1eded390d576f270f945a9 SHA-256: 5d181e0124ea4732e65d7a52f3be3ff0accd98f4db160015fbe815f500285133
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous URLs, many pointing to disposable hosting or potentially compromised sites, strongly suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://eric-parnes.shortex.com/ckfinder/userfiles/files/88233823668.pdf In PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f30e0d8d2d---63621373277.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/gibaf.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/vezozigodizufilaweteruj.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/43442097799.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/40417656008.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/7f5af7409aeaea76c564f82cf7527265/lufotemapi.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/vumix.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/toranijevovixikigixe.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/sesepuves.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161340d4ba62b2---88223300589.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/labizubusasukiti.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/pitabupibaxejoxe.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/beseliriroxejan.pdfIn PDF document text
    • https://andana.us/files/files/98959359118.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161367e810d4df---77250684528.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210908_130153.pdfIn PDF document text
    • https://alariel.be/userfiles/file/buzuwojitotidan.pdfIn PDF document text
    • http://oris-am.com/editor_up/folagowogigagagavokefebav.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/fokewafesegoxaxudiwox.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/35926267824.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/fitok.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/85799041740.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/48303192538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=alcohol+chemical+namePDF 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_off0000b405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB405 15840 bytes
SHA-256: 721258c287beaca74522a15e10d37c433829cff68cb6d3125920371530e6a5e1
font_01_sfnt_off0000dcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD0 10112 bytes
SHA-256: b421b6b7ed2967aacd5a695a12c5a0a9f21ef6669597d18a6b9dae28ee99b7e3
font_02_sfnt_off0000f320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1