Malicious PDF — malware analysis report

Static analysis result for SHA-256 5023aeabc0568b51…

MALICIOUS

PDF

79.6 KB Created: 2021-09-08 10:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b8cb4cd312b65beba2f7ab1ab50a06eb SHA-1: dd843115f7feb0042abac5e7c7b6bf4cd1da2134 SHA-256: 5023aeabc0568b510134c576cf824886a25248907a95886ff1dbad123a83c6a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://stigstudiotecnico.it/userfiles/files/45376532560.pdf In PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/xodewe.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/9q35vqc3do1p2o56f2mqddv186/3235032690.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/dalijededopalakaxejos.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/90863247377.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/32774734413.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0747a68e8---fagevowedumige.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/56492753092.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613218af8c27b---kuximosegonikuvojipirifen.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6d926ff06---16888873226.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1bd27e3157---72621253292.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/35pnlbvhgpnnncheu50u5dsnpf/21622488380.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/91722205253.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/76795423463.pdfIn PDF document text
    • http://kasargod.net/uploads/file/zivemilovajaliwupesivixa.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/moxawanajipisufexuridu.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qe41bvomr9jgo5l4jpd7lb8tev/bubinabin.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/7ea9c3d8704cf9304d67e1d1e2c0ec68/97855800473.pdfIn PDF document text
    • http://vralumni.com/clients/7/71/71e0d721b250bdad3664bf54e70089ab/File/80233546182.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098217c654ae---14369578881.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160732bc8293d0---kezokopepefo.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/vesuwoxowurova.pdfIn PDF document text
    • http://maksimetall.ru/files/bolinepumirinasipele.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608356a742189---debap.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/717314a46747284eced5ea782a98e273/41575938797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=integers+worksheet+grade+7+with+answersPDF 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_off0000d0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EA 10660 bytes
SHA-256: f5b059c73c74b68f94b3969b7f0ff474bad4bef8afa5c0f2c27f8d934f5d699c
font_01_sfnt_off0000e92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 18756 bytes
SHA-256: 6f9020c56d96ac7f661a3899184744033d7a99dfd0fa5786c49981566191bfc2
font_02_sfnt_off000118e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.