Malicious PDF — malware analysis report

Static analysis result for SHA-256 68800843833a94e1…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 04:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 997b3e858c735517c18959571aec881c SHA-1: e96d6658de0de723ecb1facdb4d91db96304cc6d SHA-256: 68800843833a94e10b4d5365950e0d7706b64805959c8b19f772c77f9330066d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to a variety of domains, including those hosted on compromised WordPress sites. The embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=auto+clicker+lite+chrome PDF link annotation
    • http://md-servicios.com/userfiles/file/kenibasudifu.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/61824338786.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/26465115660.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359f6f8414d---damigaditeg.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/fadurakabev.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/64739055353.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/86294324375.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109120755079392.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/33578728082.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/64313593616.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613349c03539d---tixuluzakenu.pdfIn PDF document text
    • http://sdds.be/userfiles/file/7802454785.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/95456470463.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/pujalixonoradurilarafo.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/a76ik9ung6kcidcdhgn5555peq/monipogope.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/nevikejizawizusususig.pdfIn PDF document text
    • http://dd-eng.com/files/files/juxuloxuduxilorabagotoda.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161414921be56e---90461030823.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a8f643d842466ce047b2ab8d80713196/33558762883.pdfIn PDF document text
    • http://timebymtm.com/upload/files/suradaxokapakamunokakip.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/selilomumozemerudekoko.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/megofamona.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c79d8181a---30297286055.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_off0000d494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 10236 bytes
SHA-256: 7beed2596059aa1d7c0111be70515fb5f7d53af2c851196145f481159b604ae9
font_02_sfnt_off000103a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 18376 bytes
SHA-256: 650602d5686acace9a7e52114e2e70d4a663e2e3f9541c46f5717ea28b814968

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