Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e7cb39ea0ae75d…

MALICIOUS

PDF

82.3 KB Created: 2021-08-15 04:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d3247c353718969363e5643f3940d391 SHA-1: d378d7038aeb7d3229cba90a3091a843913ea684 SHA-256: f6e7cb39ea0ae75da1bd89d4a9d6ab8352fa87f92ad3fb4af068dc27e728fe2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the heuristic findings suggest the document is part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=bosch+silence+plus+44+dba+operation+manual PDF link annotation
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d808d2b520c---ridederejesoxefafuvudon.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/aa4b1d2b0a69e05e10fe2415e4a46960/gomebenubilipitakojepije.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f732854192---wudekatez.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/02e6bea5ad3cd7d6f3bcbbd435871e4f/gokipubo.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/49588517889.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/m78bmkg7qbiopi57sh2388qidp/95426646227.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5517c2127---wirepumizejaz.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc3c7c1033---73039504226.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/fe33abbdf2b58c256acb5f522650a01e/37842256190.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160753e372da98---jedutixikavubenojezezesim.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/26460503602.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/fibetigazizipujako.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733ab13a78e---pulusap.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/cdafe91b5f9efd082114ef1b254b37fd/foleloromedosaz.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/zakuzotijef.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/kaul9chtpqc8q327uo7ov56631/63655019044.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/fuwemofotuguvixuxaji.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/2416631392.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/losobiwegevum.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e1b02b7eeb3e78628d78c556b1d77298/zitotesebotapizemamerefos.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/takazikaw.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_off0000e107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 11152 bytes
SHA-256: 39194780561d83c4feb6a1588967d7c1d04b6a1378d08244b243392841c2b33b
font_02_sfnt_off000112cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CD 15776 bytes
SHA-256: 0e74f95ac93ab8b35186588e8a08fa2f3093241af79e39783fc9f99441d860e8

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