Malicious PDF — malware analysis report

Static analysis result for SHA-256 a285f2f483f9132a…

MALICIOUS

PDF

72.7 KB Created: 2021-09-25 05:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85a7b9992e91c010d3f6b72aba2bbf64 SHA-1: 8be0d4873d968235fe8d9e00baf39fcaa789de9d SHA-256: a285f2f483f9132aede8093f804d341d7a04df3335100ff0a8672ae2ea35b67c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised websites, including those hosted on compromised WordPress installations. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ketchas.ru/uplcv?utm_term=android+tablet+flash+firmware PDF link annotation
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/liwoxokusilapamurufe.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/23477107490.pdfIn PDF document text
    • http://huiking.cn/uploads/file/050447243361.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/51700255465.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/muziki.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f494f83a0c---gimir.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/vatoremix.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/35213679097.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/20344044839.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/pisabowutovaxopurowusiw.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210907162438_bXVnaXNv.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3f3bc81b0---vatulumimijuratam.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/diged.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/39625524525.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/75745218537.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca9eed62ff---40295005560.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/53081878652.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/vokavejazuluginu.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/rjk8ij0f4bs3th2craho3l8660/jozugubogovegipozigugumer.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/43317752901.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/baxedovakareje.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/89079393971.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/rodidudetufugudonifuso.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/94914451639.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/besozojupojutejogosok.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_off0000b69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69C 17652 bytes
SHA-256: fae2c64fa02f367848f66f9b1e64016c0121fb78354f4d764572452aae55dc20
font_01_sfnt_off0000e402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE402 10828 bytes
SHA-256: 37b45f285d6414b17df84f3e37af42b43c1d6830d4e69210597d88d9576c8dab
font_02_sfnt_off0000fcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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