Malicious PDF — malware analysis report

Static analysis result for SHA-256 f209b808f0c82dd7…

MALICIOUS

PDF

93.2 KB Created: 2021-06-29 03:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9bcb46ac8a97ffa2f8da6d523833c7e6 SHA-1: 35f7eeea89ebc1b5d46e3ab1129181a21b192522 SHA-256: f209b808f0c82dd7590be14a30c64bee1a005aa245dff843720f87bc81cad3e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript likely serves to exploit vulnerabilities or download additional payloads, contributing to the overall malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://crewmak.ru/uplcv?utm_term=slow+motion+video+zoom+player+pro+apk PDF link annotation
    • http://innospectrum.eu/hirlevel/file/50561600878.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/fupokekuketojetifum.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/26846303964.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7b15acc7012db172186125c50747e997/62432537540.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/31969833084.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/411518601ab1f3c5b65b220d44ebbfec/jetubulajevafimolokipak.pdfIn PDF document text
    • http://www.bash.cl/media/file/51565177210.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/0bpdlj6g3ikc6o2j0dlct2fr91/visekexesagul.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/30de886980d8d0fc3ab09936f38a65a9/91646494377.pdfIn PDF document text
    • http://amdind.com/userfiles/file/68930133318.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/da12b5261faeea5da8b983e313669b5d/rumigoz.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/82395642013.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770ee365a55---92375693134.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/93l293v3pnv770vhsk82svnr2n/58833407747.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4764c1aec009aa0b7d5df99a011ac4da/53012864666.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099b70215bb7---bibaz.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/9rufgk73sfegtafp9rdnhmdln1/62708872309.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/8f1739a633b59a0b5a5dee27c3e87c7b/60975792318.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/11547644675.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///tebigunarinofarotuw.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/3c63c9d0324ed317fbf4bbaf3297fedc/19939862418.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/gazowisajuvofumosorot.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/te0nqtntqi19d58ed1t3f851jm/xatexelojofaximu.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f7881f664---31374448005.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/46928130551.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4382ca7490---laguvipesodazamoxe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11701 10876 bytes
SHA-256: 2ad7fbefe0dd400e4b6e7871b95490c08fb9d9c916f97f0f975301e0e2920e5a
font_02_sfnt_off00013037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13037 18276 bytes
SHA-256: 2f9f43f73f9a47bc17f2382c0ebb10e9d089ca7c602f4d8b86a78f3df9120097
font_03_sfnt_off00015ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EF4 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13

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