Malicious PDF — malware analysis report

Static analysis result for SHA-256 27327ca526058f6e…

MALICIOUS

PDF

80.1 KB Created: 2021-09-01 07:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0640fff3c5de512914d00a33c5b5ff78 SHA-1: 4fa0d1cb9e6702f74a4fceb46283501caef533a2 SHA-256: 27327ca526058f6e2130767ec74a65f7433b527c09813ad855f4ce4f310b7bb7
164 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous links, many of which point to compromised WordPress sites, suggesting an attempt to host or distribute further malicious content. The presence of a link farm on disposable hosting further supports a malicious intent, likely to obscure the true destination or host malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • 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://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba095a1e5a---jipixogikag.pdf In PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968babcaaee---tatazogasobe.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/moxejufidurosunakade.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/batodolakodisipevuru.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/jegelanilowasovewaju.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e044ed8e219---52944769428.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/tisulafetisapoma.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/55922cfa957d876229391ddcc064cd75/27290180825.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/29336361527.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/43158384614.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/b3kcq8t9qjff8ngktrkbslj930/7591272150.pdfIn PDF document text
    • https://steammining.com/userfiles/file/wozerazefurabaxugoxi.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/gojegu.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/35da89ace56fa53241595ba671e2b0e2/42233648194.pdfIn PDF document text
    • http://ecole.ru/text/images/file/5617644862.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc41ba70d68---rugasipufumekamuf.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/baviwejozarufur.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2125d8cd11aa546ec3fca81d355995ad/lemeleb.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5aa9b3dbf2---ralosedifanuwa.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/31231511509.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/acedebe293e34f263454806908b5e8c3/towaseneg.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077da4f74ed4---bazotujedugu.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/gedokolawemu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113610d46e10---gosuzedadozegixani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ponniyin+selvan+pdf+with+imagesPDF link annotation
    • 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_off0000cb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB96 21068 bytes
SHA-256: 42bbe3e06561cea33421d512b7765e89743cc8ad373eafe5e92a3a676c2182d1
font_01_sfnt_off000100b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 11112 bytes
SHA-256: 9a45470a9f3738535ef00b2770832d778deafd17248678673d54f17cb13efdba
font_02_sfnt_off00011a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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