Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9a7b54035cc718…

MALICIOUS

PDF

220.9 KB Created: 2021-09-04 01:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01c92429020064ed9a671097e7b2a513 SHA-1: e5d95be814672502d034be3ad621179bb6e5ef51 SHA-256: 4f9a7b54035cc7188d66f7a7c0eb92b5846c0ad96f4d2392773c6bbfbd732004
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a high number of external URIs, many of which point to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through these links. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

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.
  • 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://infrive.ru/uplcv?utm_term=syrian+colloquial+arabic+pdf PDF link annotation
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608abec9dc17e---27386257149.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/gekuga.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/sorosesevisiwe.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/bawekovezuboki.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/18733832368.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/23413754491.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/rituzadonuganad.pdfIn PDF document text
    • http://artattack-concerts.de//files/file/33078216312.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/5kp2nr441e9nif1564n6mohg9t/54216872118.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/122082916c5f83b8fa273bc140ae6170/polamuxaxepit.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2913d92f3---gegulizoxodujokafeva.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/541ftoud3po2c4lh5itt2idln3/wojulaxodebawusopiwapul.pdfIn PDF document text
    • http://marketingnews.fr/images/file/wimofafebabelumi.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/gadovubodisa.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/51042433086.pdfIn PDF document text
    • https://songhongresort.com/img/files/meripumaviloleritofijif.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/26480852931.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acde241520c---2845779042.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/jitive.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/11987626707.pdfIn PDF document text
    • http://xn----dtbfdwc0aaaev8k.xn--p1ai/ckfinder/userfiles/files/49629849366.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/rerozudowazowazorus.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/97e05d9936ba70333ad2c297c5a7daee/famaxopixexonawa.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/fanomitamuwogo.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_off0002fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FEE7 20756 bytes
SHA-256: 0d12b47dedb7ac1c604ccfcf40e708d0bc46b5471e7bd3bb9c1abe5bb4b85ea6
font_01_sfnt_off0003350f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3350F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00034d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34D26 10788 bytes
SHA-256: dc7bfe6e3d7c525c4293433c79a5894fd3faa9086130d85b595afa76620a0064