Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a43ba3c0948e24a…

MALICIOUS

PDF

89.9 KB Created: 2021-06-29 20:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41fbb4f4147924d1b709be9aeb208aae SHA-1: 8030aaece9c3cdb28845441013d70fe81934558a SHA-256: 9a43ba3c0948e24a7e4a801b7e9c1e883d4c225297d815342cd310bed039d74f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm with numerous URLs pointing to other PDF files, many hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content through a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=learn+sql+in+a+day+pdf PDF link annotation
    • http://webinaris.net/ckfinder/userfiles/publics/files/gupaxinom.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/44aaccha5g9alsqf9nkkqgpkr9/91921875738.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/jebejep.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67e6ebd322123dd2c5c927a26fa121a4/bejufogulilunemodule.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16070521fbdbcc---77384587917.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16088ab8420efe---38009005628.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/bobojurotebofobaruboz.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/u7s1q94hfdolgd8eqdof5u8ql4/48539848665.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff2f10e7ad---mijiraliposijefudufasuw.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/xolarunuzepemakaletitut.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fe6b1f67a---19054727269.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5e7c30b6d---mepiliropove.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/f91d5017fb518bc1a131bf4697f65ffd/kigebutuzoxal.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607485484e6c2---97330261274.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/gotugelumexuwirazi.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/28a2ac1c62e12e025f2dfd5e3dbd0369/jikemu.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/99163285509.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/uadmgehtmkcdeeae7tvgiqu1ib/6798560100.pdfIn PDF document text
    • http://imaginove.eu/data/Files/61297200499.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/wulobejovuwuvexokobol.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945a83ec6d5---wobesaxefave.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d42f7930a6e---solezul.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/66022460348.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5527fa93b6---siruxafem.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_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C4 17684 bytes
SHA-256: 37c1729b92e69442d4df942c5ceca4f2991afd9a6d7c0207fc59b3d4b783c1bc
font_02_sfnt_off000142e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E6 10488 bytes
SHA-256: 99f57fb8f94a6805312f470b3bc1ef959c1ecb8967d5c5e3619e349449bcb3b9

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