Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f0a355fb2e6dd3…

MALICIOUS

PDF

99.9 KB Created: 2021-08-11 15:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1e7f247b4fa8b2e9c69a90df2ce728dc SHA-1: dbb581f284ee0afd45c3da253fbd425680268c2d SHA-256: e4f0a355fb2e6dd38aed1d178f54e612642adf701671d40a9f7eabca61a57395
156 Risk Score

Malware Insights

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

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, containing numerous URLs pointing to compromised WordPress sites and potentially disposable hosting. The primary goal appears to be directing users to external sites, which could host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e7d0da565da6d19d9c9dca67f9620018/37042434372.pdf In PDF document text
    • http://toshiba-center.ru/uploads/files/xezugexedupuxaxerarake.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/66939411219.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb62353944---48880699361.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1626957305.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/4069ba787049b9db35a1021ee36d7d3e/bukonebepasilifenefigexot.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/toxevonesomuwirunevatudu.pdfIn PDF document text
    • http://cloverdiamond.com/file/61649813515.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/7dl97a7dd5qgbni0fdjp3tpnk0/zajaju.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/toxadabikigu.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c59e5949d1---mimexujireresodotitovo.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202162301191032.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/mogeverojarinujibud.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a5ea000ff---64321076170.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160dd95f767012---51384072718.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/letire.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160728cf914833---zedolipuziditiza.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/15159667982.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64f76a7d96---sakibovakininiwemufix.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/makukusane.pdfIn PDF document text
    • http://ohstigers66.com/clients/d/da/da15611725e7ba20b6827cbf2e24f87d/File/xanupejibegalonasobaret.pdfIn PDF document text
    • http://thaide.org/userfiles/file/62290908084.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bc5baf30f---15589069283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=dieu+vous+b%C3%A9nisse+en+arabePDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00015dd3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15DD3 20076 bytes
SHA-256: 34688971e6e59f5975e1ddc02a523fa4dd99946083f8fbffd0c742fd328722f5
font_00_sfnt_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 19504 bytes
SHA-256: da5919059d9dd916ce1aa29b742458459092b77c4c3bd0f86c682c9ddba975d7
font_01_sfnt_off00012e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001465f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1465F 10420 bytes
SHA-256: 1657eaf30751896e7430ab8fef5b34d9ba8fc028e21ae414a47488c1108dedc7

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