Malicious PDF — malware analysis report

Static analysis result for SHA-256 163e58dd42c364b7…

MALICIOUS

PDF

81.2 KB Created: 2021-10-06 22:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 647d9c5af0d0002081a3d16170969800 SHA-1: e982843fd932634e631b5b66dbfd4ed7cb8e375a SHA-256: 163e58dd42c364b7a5e3648a9b19d644a91dfe4d0c9f2e7bf855a9702ce819db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage and disposable hosting, designed to redirect users to potentially harmful sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://metrosecuritynepal.com/assets/userfiles/files/pinesomivisezelukup.pdf In PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/2dade06f8c4ca0277588c11db9f66a78/dasupok.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/kiranefawinowu.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/66203833832.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/2b69f6cfe605f0116f0082211857c0ea/noduxezaneporevifepexoja.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/51360033751.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/taxikemepitopajudabaxivux.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/wugegagajugileregitud.pdfIn PDF document text
    • https://garankuccu.com/upload/fckimagesfile/6c554c1b1ced9cea44313845684a882a.pdfIn PDF document text
    • https://gdwtechnology.com/fckeditor/file/In PDF document text
    • http://xetaihyundai.net/upload/files/jozigebonizufar.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/kikagi.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/guson.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/papuxig.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/bobinotiduwitaz.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/bisuzemesop.pdfIn PDF document text
    • https://km2804.com/ckupload/files/dikegogoxezutamibizewobo.pdfIn PDF document text
    • http://xtra360.net/campannas/file/29056270060.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/bimigowupebomaz.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/lebexodegatobibi.pdfIn PDF document text
    • https://sin-wa.tw/app/webroot/userfiles/files/3331709293.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/47070682570.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/b122493bd09914568644c00f963a13f0/26565511242.pdfIn PDF document text
    • https://bela.geekers.tw/upload/file_folder/file/76976596275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=universal+life+insurance+meaningPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64E 10636 bytes
SHA-256: 48be54aa38df3e2f742a3ff2b33956f9127d09a8ce3bcd449e27887995c57b1a
font_01_sfnt_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 18652 bytes
SHA-256: d0adc75bc81b847c2c039c645de36cb26b625775d6085ef4f31904b541ff8b59
font_02_sfnt_off00011f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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