Malicious PDF — malware analysis report

Static analysis result for SHA-256 b406c3b5d379ed11…

MALICIOUS

PDF

87.7 KB Created: 2021-07-31 17:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c9da291e39f8cdda8e64f4175ed4c698 SHA-1: c845a0a26f90c889dfc128f5ff2ebe9efb79df06 SHA-256: b406c3b5d379ed1140d800e86d2e645c84cc53441b5a4efc30d038ee0a78969d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs, such as 'https://coretry.ru/uplcv?utm_term=ethiopian+songs+mp3+free+download+2017', suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=ethiopian+songs+mp3+free+download+2017 PDF link annotation
    • http://notariocprietoa.com/notaria/documentos/files/76780198299.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/wetipuguzuza.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/46358886157.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c41d2b3a2b3---47906933720.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/rulejozamupafawijiganibow.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/vc17ics9hllpvas3mra6n3hj0d/84669789894.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fofar.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/riwixixamutakikogigub.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16084e1294d86e---99653696389.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8pi3roftscb226lplaj3453p57/77155384722.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/c2d2a6c95307bd54aebceceb785acc89/vozerik.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/8533349744.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/xojodaxebuvomigibo.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac36544ce76---47809789713.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/e88590592374391914d80bd59de70df7/xonabuxetusavej.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/69433515917.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/14473440077.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/zivisumerevuvejimodove.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077ded456a25---83899842999.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/kojoxaz.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/203bf899cab1a0d3b2cf7d3a181345f9/81623287163.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/jq0724fsf0muc1oiimf0br5360/xefasigokalubapawopo.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e6b7c4fa6---45001714486.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca0c46943---vutuselures.pdfIn PDF document text
    • http://iwishop.hu/file/silufasidudujexa.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_off0000ef86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF86 11532 bytes
SHA-256: 2ae8daba4276ecd90fed1bb5cc48f6df05ec7cfcb5f9ae080005b59caa887129
font_01_sfnt_off00010aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA8 18380 bytes
SHA-256: 7b6ab6e71a9547d9ab64d8bca07f81bc496a08432e2494d200f3dcb2a69fd794
font_02_sfnt_off000138c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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