Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f81b885dfdaf988…

MALICIOUS

PDF

77.0 KB Created: 2021-09-20 09:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a99ff23410310f83688a838409c232a7 SHA-1: 83603bdc16502498c17da75fd84afd7a7eb67ba8 SHA-256: 7f81b885dfdaf9883f7908a700823789a852eb0517579d32a74a40f4786f20db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=hill+climb+racing+hack+apk+2019 PDF link annotation
    • http://saktigroup.in/uploads/wozinixa.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/zapebikevaxeka.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/41852855499.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/kerulatuduz.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/wunevudosuwalupuziwom.pdfIn PDF document text
    • https://duel.pl/userfiles/file/25044755451.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/73667289228.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/febebanojirotajivejijupup.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/xiwizilanubuponabogagipaf.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/9287542419.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/096c4291dc45db535214e4b09e243031/80484426553.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/74705566442.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/61589386067.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210907_505EF930B478F397.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145860295e09---55469371023.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/39158481576.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/tilovinefidatewip.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/mumuv.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/13821463171.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/subax.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c222a078c---66648845748.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fewita.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/13798058601.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/72611061330.pdfIn PDF document text
    • 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_off0000c8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BE 17328 bytes
SHA-256: a17a5603dd6a5234af8f0fe8fc1935d8f54ce5a96531da0bf874e7f88351abdb
font_02_sfnt_off00010d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D60 10988 bytes
SHA-256: f6430a1b3b8abd342a23eee0d368aed64a50dd78f8b59164297a21265e6a7e15

Open this report in the interactive analyzer, or submit your own file for analysis.