Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e7a70081447091…

MALICIOUS

PDF

87.2 KB Created: 2021-09-17 21:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 826827b18bd2d373d0b8eaa687635504 SHA-1: 3221299e322f7fc6d4688a16c566ff21970daabc SHA-256: 98e7a700814470916a78642fd1036b65a9905e7ef5f2622879903fe602e2f52e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://studiomontironi.eu/userfiles/files/gulixoxuwak.pdf In PDF document text
    • http://nenayu.com/filespath/files/20210913123721.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/43067482493.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/37aa475f301c20abe70390a031cd06c0/lakasomaguripunosede.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210907040449.pdfIn PDF document text
    • http://colonia-hausmeister.de/uploads/files/vesesidazigi.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/rudijazexuluzoser.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/wanejikagukopiriluje.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/10005400986.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/galipofimadasurikafoleki.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613ba1b42fab4---nusoximuxijaridul.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/42487398356.pdfIn PDF document text
    • http://atomleasing.ru/media/File/nejigegesave.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/fupekebuvuturuwu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134332ccb8a2---kakobutuwujub.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210914_A07F2E1840B0002D.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/98829475575.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/847674159.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f28b7b22a8---tokiz.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/zisuvabipezuf.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/47229189057.pdfIn PDF document text
    • https://12shio4.com/contents/files/42145492865.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/66164895141.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/xozijidizanisitojopula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=lightroom+mobile+apk+fullPDF 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_off0000e34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34E 23016 bytes
SHA-256: 0feee72aac0fc72f6195adbed096ede95e32f43627eefbe9012461ce84076a2a
font_01_sfnt_off00011e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4C 10824 bytes
SHA-256: 6b4cc179fdae8358006a9a0c2c37e8a260cf1a9d8b7661d2ee5955506d47ebd9
font_02_sfnt_off0001370f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1