Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b575a918cbbebf…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 23:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 6af549939e9351d0a8bb653670ef7141 SHA-1: c55b135448c4271462303b6c6bf02e4d3d2fc583 SHA-256: 96b575a918cbbebf134b0486a1c095fca88e9c8909e49c5b2d894575fd2a1e88
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

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://nomylo.ru/uplcv?utm_term=what+are+anginas+in+spanish PDF link annotation
    • http://jtg-antracyt.pl/files/file/69300312275.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c167f584ecf---putururu.pdfIn PDF document text
    • https://diphong.com/uploads/xoloviwavudajev.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/76014207936.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/72055337820.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073513bca535---wovisewera.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/a1cd3744fe9977194b409ec7fb49d0cc/58465042422.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/visitixu.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/28162452333.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f70401ae6a4---wetarowowujobimizoxirovod.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160799f385b017---jarikos.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092ce6e4b298---6396766441.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7659e5f9c---fosejuj.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/91580294052.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/vitepisugurig.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/12337177110.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/robidesopo.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099558736301---saresebugilemizozavimuv.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/xipugilarevuki.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/ebda5fd295dbf568f8ab2bd155b69c3c/lamuxokopiwawapobojuw.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/abc2df07b7cfb65e966fb4e05fe9809a/87507173688.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/koxumatuwilebexuxokitewab.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071e770a1197---44418987192.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607649e0d334c---14251585269.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/gepedolusigojapu.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/65326411818.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_off0000d795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD795 18864 bytes
SHA-256: 78058050838a94c90337f6e0ac7ef09ebff9c19dfe1450daeb17c329f9576f5f
font_01_sfnt_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 10356 bytes
SHA-256: 87135d34400b890dba454a0c1366cba7f7687793ee84966280aae3e5afc1779a
font_02_sfnt_off00011fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1