Malicious PDF — malware analysis report

Static analysis result for SHA-256 727f0073d2833b09…

MALICIOUS

PDF

82.4 KB Created: 2021-06-09 19:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0692d35bed311c5ad8519a9613ca5af3 SHA-1: 22b11828148f85820a343f79ac6f5c31c968690b SHA-256: 727f0073d2833b09e2b0a55a47ee0b15ca7b360d637c74921aaa0f834ccc8e7d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple suspicious URLs, including those hosted on compromised WordPress sites and disposable domains, under the guise of providing geometry worksheets. The presence of embedded URLs and the overall structure suggest it's designed to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://infrive.ru/uplcv?utm_term=10th+grade+geometry+worksheets+with+answers PDF link annotation
    • http://alibabashipping.com/userfiles/file/87258490171.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e3db1a9126bb34ccef1ce0ee7551e87b/91447908504.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608263e51f24d---gugezupegeki.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793b8672044---17987872222.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/49292827530.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981882db9fb---dikosixopijalukisamewuxom.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/sivagedefukeru.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/50049862954.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/nalefut.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/puwuzedob.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/01855b0d545cc36f1b10e71bee41a9b7/bavalin.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/c814ba15c8334c8003abea8e37504415/11178788186.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/74239296954.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/4268b767c9e121b0ad753b94cd70e851/lirizubaduro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10243 5564 bytes
SHA-256: aa51e9fbedc713947ac3f75dd86b163a0d9472e027e812d99a4f85e7991dcc31
font_01_sfnt_off0001151e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151E 11596 bytes
SHA-256: 52fbab848581594f36c46334f6a08b507f50d3a534abe0e0e811a78fc0ad32a4

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