Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d3d1818a0268b7…

MALICIOUS

PDF

79.0 KB Created: 2021-09-03 07:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 893e95effc7961e75ae034454eddd873 SHA-1: d85533cae731dcc004bdd6ff2ba7af03ec2ad8aa SHA-256: c1d3d1818a0268b762b08bb2c57ed863e16f55b01a6eb9a116af5506c1a9c6a9
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV identifying it as a phishing trojan. Heuristics indicate the PDF functions as a link farm, with many embedded URLs pointing to potentially compromised WordPress sites or disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://rajskiewakacje.pl/userfiles/file/91603371414.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16113a1e069315---ponidezikon.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/vuzom.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/kigavuxav.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd9f12cb4d703b9556f8846b8e08a144/xotibagurunefekuxi.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/nafiropa.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/davenup.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/08hpr9gj23etisebrlei4b5gf5/bizefufuveko.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/lezimidakoko.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/sipolelezijod.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ac816e2b8db9d44dc7cc7cf21869cfb7/45198854092.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/solepenuzebegivorobif.pdfIn PDF document text
    • http://www.toptehnik.si/images/fabas.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160890993d4c3f---pudewu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbb6359c18---97706698047.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/fonibufojasemewafa.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d20db00a17---32629886091.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202162992957501.pdfIn PDF document text
    • https://tavio.ru/files/file/guxuworiradosipini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=reforme+paces+2020+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3271fcddbd---pusaguvomok.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/51918889623.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_off0000d06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 10728 bytes
SHA-256: 7a5975e29f2b7bf93154fe2f5790c27a76df50650823a512125b3a8adce90652
font_02_sfnt_off00010133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10133 17612 bytes
SHA-256: 998b1941ec7e996b315910a5e609d5f7b6c540dfe17ae30a12f25173f45c09c7

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