Malicious PDF — malware analysis report

Static analysis result for SHA-256 560d2c31753a74fc…

MALICIOUS

PDF

85.6 KB Created: 2021-09-18 05:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 70b15f771760b458368fba244ae2ba03 SHA-1: c174a1ae859f16d77b874e1d23755acf6799d687 SHA-256: 560d2c31753a74fc7171bf4165b88fcce2a3027422cc6e23b3de70ce5ae88965
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such sites to distribute malicious content or redirect users to phishing pages. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=can+i+text+from+my+ipad+to+an+android+phone PDF link annotation
    • http://gddfboiler.com/uploads/files/91895032390.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/92459236742.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/rivivobilowopesozab.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/50123595027.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/2095343055.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/bedabijofo.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134f46e73733---ruxebabigasijo.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/70986869460.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/98cc39cff6456acee63a40e54d3bd6c1/50276884490.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/xifirureva.pdfIn PDF document text
    • https://christianschoch.ch/userfiles/file/61262809445.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/rutokurifekojoveden.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/0cd9730671de9d3812de7447fb04108b/ladilogokure.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/32362347428.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/zoxavopumuwosi.pdfIn PDF document text
    • http://dfanchem.com/upload/files/palobeneme.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/kopunaruvosuwetatasijo.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/kekekej.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/97943807761.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/geguxa.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/78080480593.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/21071569122.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/sejobopizoxoliru.pdfIn PDF document text
    • http://levotst.com/uploads/files/gokafenob.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_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 17620 bytes
SHA-256: 1dfeaf00c7353ffe93c3bf692f53bb5dd61098a0f6368306346eeae516157784
font_01_sfnt_off0001179e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB5 10796 bytes
SHA-256: ef3b31b3e2262c3255b976a9823f63b1ed5f3f9ef0cd54391329a1c72d3ec87a

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