Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9155e0f1337fa6…

MALICIOUS

PDF

81.8 KB Created: 2021-09-24 11:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8cc2784dac619ee5d7fcf251035c3a8 SHA-1: eaf5d0656df5b2c46f7e110b365f572b7db15d84 SHA-256: fb9155e0f1337fa6be411467513fe1d1877021f832f9bc475b29616f2025b1e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URLs, many of which are hosted on compromised or disposable domains, forming a link farm. The URLs are disguised as download links for software, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://queure.ru/uplcv?utm_term=naruto+ultimate+ninja+storm+3+download+apk
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/39566912414.pdf
    • http://aprt1day.ru/file/joturijivodibotimogaxa.pdf
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/bizazu.pdf
    • http://naosgym.com/userfiles/files/bipulezirukolo.pdf
    • http://lafenicealcamo.it/userfiles/files/gapazubex.pdf
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/pafanavefozap.pdf
    • http://cn-junsheng.com/upload/file///202192194868826.pdf
    • https://equator-maritime.com/userfiles/file/rulor.pdf
    • https://hchoanglong.vn/userfiles/file/78298993901.pdf
    • http://fohow77.ru/upload/file/pogirobekupo.pdf
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210916_102B061EFBB98856.pdf
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/2672606875.pdf
    • https://maggies-handmade.com/UserFiles/files/fabodukurul.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/f602be8a2142c332e2b2af1e7f0f25cd/zodonewanurotinok.pdf
    • https://simondaulte.com/ckfinder/userfiles/files/tuxageweximadiwibonepofo.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/7f227ec7d1a8f5276a9a57dc2989634e/nokakuzijozudetegu.pdf
    • http://friend5190.xyz/js/ckfinder/userfiles/files/boxesutapa.pdf
    • http://reklamaopole.pl/userfiles/file/repobij.pdf
    • https://dlt-nkp.com/fileupload/file/zuxovo.pdf
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/60242284065.pdf
    • http://fullerton.kopanramen.com/uploads/files/90097248915.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/83b55338bbc0e3c15f4a696ec941a720/21394530641.pdf
    • http://mopi.eu/ckfinder/userfiles/files/xekodok.pdf
    • https://vroa.pl/chplusfiles/file/seboxixijo.pdf
    • http://livelyway.com/ckfinder/userfiles/files/nozavajunarizasemiwi.pdf
    • http://www.tramag.pl/upload/file/10692000565.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5eb.bin
892c7c4f73c2fc6e7c9f6badb8c6a96d9874d824c44149e46a35da8bd3535021
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EB 11112 bytes
font_01_sfnt_off0000efdb.bin
639456c77ace86d0eb173528a28648dc92006bf8b810a268e5aa3db47ed4b288
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 19116 bytes
font_02_sfnt_off0001214c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1214C 16792 bytes