Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f5986fb991b140…

MALICIOUS

PDF

84.7 KB Created: 2021-09-03 21:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d67942c37a52d1b6eec5613b06eaf8ce SHA-1: 9c4d5cfa60a4050344209e0c6459ea51d2f763e2 SHA-256: c8f5986fb991b140ea48dc74f06a917ace90e3746b00440a9bc2f3ce3f0f2717
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=world+book+encyclopedia+2018+pdf PDF link annotation
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/10v75f45khatvjo0kp93o9da7u/70422300582.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/f91bveahq9vpd731fqmp0vp6fb/wigugulexu.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16094d02f0a324---lefopebuvibogez.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c66951a908b---veserujisupanupip.pdfIn PDF document text
    • http://walker-doss.com/clients/4/45/450b4a4af5ff3f13851793278d9c7ef8/File/43693396687.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa08f220a07---68062749189.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/a24f7b7c62466eb8c792e9e25bcea2a0/51408262560.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/lamatixir.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/f7ej79mn8d8r586mmgeha2m5qp/85082261330.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/13222599105.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/78856555961.pdfIn PDF document text
    • http://ks-puyuma.com/CKEdit/upload/files/komugawimerelamulikoxopez.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/sokovopuwinavebal.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16077d544cc30f---49933495559.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/nanaginadebetex.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/53652936684.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/48mc9vtmbpflu76vfa0tsdplv6/70735535843.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/89234024155.pdfIn PDF document text
    • http://sinhadventure.com/uploads/file/92954092042.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/8909177806.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/vavozit.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/xogoson.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_off0000df89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 19456 bytes
SHA-256: a6034c7de31086355711c3bd6719540830355830abfbc5b089874b3045e93a15
font_01_sfnt_off000112e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E2 11188 bytes
SHA-256: 7fb630a6376e7df6cbd488db330520b1df4157b9c52d6b528f4eddd8002eb164
font_02_sfnt_off00012d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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