Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdac8ddc0f8f103…

MALICIOUS

PDF

84.3 KB Created: 2021-06-27 07:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0dd429bac53660aa03d84af37bc92cc SHA-1: 0af21572e060f021023d02863a242405af5aeabf SHA-256: 7fdac8ddc0f8f10386594462c50b53547c5810eca3c0d52c93f95d4a8944951d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The presence of a 'utm_term' parameter in one of the URLs suggests a potential SEO poisoning or phishing campaign aimed at tricking users into downloading malware. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://nomylo.ru/uplcv?utm_term=gta+san+andreas+download+for+windows+10+pc
    • https://giustofiori.it/file/wofudelabesijo.pdf
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/37161597728.pdf
    • https://betentour.com/sites/default/files/file/lenelinepofalugegirofav.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/cbe6d061d6592524b4fafc47d57e7260/94576627547.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/ab4cc92f74300463c0439aef768bc028/25157650725.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160aa946591cfa---4458544301.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817a88ef138---2366632197.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e0898c1656cd820a8ad04ec9fa1393e7/fovemojalupivajunake.pdf
    • https://fertilizerproductionprocess.com/d/files/kitewezivu.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf282634a1---72306126469.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/640eb4ddb21b535192d4bbc7f76af169/12721691141.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/07d6740dd3111440e54f19be4164a639/baxadowevetiremu.pdf
    • http://ecohost.ru/pics/images/file/43978490017.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/qft3v6t407ecril97gp718hsk2/fogonu.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/827c36096f63f0f287d916a1aa7af7e0/97787291014.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b124fd32b6a8cdf3781ea330d0b3a929/74723495402.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894a16d8046---18034544611.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/263d198c311cdaab757236a4509175b3/dusosebili.pdf
    • https://living-stone.lu/userfiles/files/35207970296.pdf
    • https://barcelonamedicalcenter.com/files/galeria/files/25643299163.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/319d5838f0b0894d5af97eb60ad97c01/2437665835.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b54fd6b44252b65fc2efc525071c46fa/37546030129.pdf
    • http://mikomisushiwc.com/uploads/files/32650459460.pdf
    • http://donghobaoan.com/uploads/files/tojirik.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0d61dde7f---61795331218.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/lavuwejeridav.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_off0000e536.bin
5c96c4631395fd1632e692a4471c5553e38642ddb7059dc02b7653e1232e1343
pdf-font-stream PDF embedded font (sfnt) at offset 0xE536 17388 bytes
font_01_sfnt_off00011236.bin
3475472dcb374ddbcffd08fbe5c48d69140dac231187f5193f32d2afe77bad78
pdf-font-stream PDF embedded font (sfnt) at offset 0x11236 10912 bytes
font_02_sfnt_off00012bb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB3 16792 bytes