Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf4978e0568d43d…

MALICIOUS

PDF

83.1 KB Created: 2021-09-23 16:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b30373c193434151af643e9264060cf0 SHA-1: 0a665b41787d801040d91403d63b7c145909407b SHA-256: 8cf4978e0568d43d4ab1c2b6c3137212f89061d5fc25c4696b6621107c405930
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The presence of numerous links, including one pointing to a compromised WordPress upload directory, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ipai-bg.eu/img/file/mibisajogogigalibalu.pdf In PDF document text
    • https://kalimati.in/userfiles/file/78119107517.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/vodumiwanarofejofaxukiwe.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/kafaxavage.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/fefuwavizulotagi.pdfIn PDF document text
    • http://thepducphat.com/upload/files/vefepine.pdfIn PDF document text
    • https://acerocorte.centralcms.cloud/galeria/files/towurewalares.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/81463680413.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/bogaxewizoxut.pdfIn PDF document text
    • http://feminella.ro/upload/fck/10190635276.pdfIn PDF document text
    • http://asfalon.com/__files/file/41251972811.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/20496500806.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/muborewapuxijoxibejad.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/gomazagobolukadejelanet.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/38463363032.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5751e036af0fbb6af7cb05d32ed941a6/98443162682.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f8c6cfac91e5f1a4f87da2ff19fa35ac/23280760127.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/liferasuro.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/713252433f584248528ce091522c0e81/sipogonomosalagivuzi.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210902021315.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a92c690440cb605d0b5796dc1c69c595/67303102320.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/90613957061.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/latibekenobudazidoxarimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+long+do+deleted+text+messages+stay+on+androidPDF 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_off0000dc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC92 18848 bytes
SHA-256: ba5e360ce24cfd82e18868c18a2577692b97abe8e7ad045afef0e076490bc9f4
font_01_sfnt_off00010d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12595 10884 bytes
SHA-256: b4550de185c03d914227867e0b7e8a48bc8fbd5f90f6b2224d21d66929368b25