Malicious PDF — malware analysis report

Static analysis result for SHA-256 c216ab0a02e494c8…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 17:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2aab2ab93ca71689222de856ea11256 SHA-1: e51f8ce9a179f19eb287a2460f64251eea2e28a6 SHA-256: c216ab0a02e494c8914652f756e576fd732761bb01e6a35ba27296e1b0b942e2
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 potentially compromised or disposable hosting sites. The presence of numerous unknown URLs and a specific compromised CMS upload link further supports its malicious intent as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.binghan.my/userfiles/file/54083435135.pdf In PDF document text
    • http://kngsm.in/userfiles/file/89355486218.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/wajogevukanovesipafupusi.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2c66d8675---bunutijotokujolapined.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/lafazovizitaxiwavadix.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/70584605080.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/kexivef.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/polubobofevowa.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/sogusi.pdfIn PDF document text
    • http://oguraclutch.cn/uploadfile/files/fogezokim.pdfIn PDF document text
    • https://fratellifurloni.it/file/7302743720.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/31711633080.pdfIn PDF document text
    • http://sjanzee.nl/file/lesogaserer.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/6fef87e0c705a2cb9bac84c97d0eccb8/zavamidaxupel.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/67333131777.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/69755185123.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/66660498262.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/63879570340.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/94881524934.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/tawax.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/dibupamediboraralavoj.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/95033256560.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135577270544---vilef.pdfIn PDF document text
    • http://kisito.com/userfiles/file/rilaka.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/lunukud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=naruto+shippuden+221PDF 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_off0000b36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB80 16272 bytes
SHA-256: db3d3decc405de46ea6d7a6a5fac01abf62ae5b0bbbd89962cfe1245c308b563
font_02_sfnt_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 10692 bytes
SHA-256: 22ba044b782c9d93fe8f0a9efd594527c18d60f518794906efa2ee03b25438e5