Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57643adb62f3dc8…

MALICIOUS

PDF

86.6 KB Created: 2021-07-21 13:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 36413dcb5d19655007ae991551ada91c SHA-1: 2792c0f87a6ead66ddbb8657f50f134a1aa8acba SHA-256: f57643adb62f3dc85e18505c07ccca16473c8266da4ae52adda3ee9fa775973c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a tactic of using a seemingly innocuous document to facilitate access to harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://nfrostov.ru/upload/files/nogakajutelezubizatar.pdf In PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/xusojopexuzitemebude.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/famitiretezifajinurutija.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/356067334a3d9d975156ff30460729ab/11891826117.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/sodosukijimexeban.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/k67al8ral5re1hmqdnm5ns8tma/fupipuwux.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8d5362249---dawejos.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/48277431046.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60b28f286c---judapuketuwarumi.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/97a730f3c5fa3212267bbead6c79ad83/fujinuwi.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/93299958365.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/xopomabokujefizogeb.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/92936322958.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/wesukurot.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/f06636bfc872f5d3c95c902632fb93e4/sogegaluvob.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ceaqpfmljijlikp4jvqk99icm1/71482210043.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b018c51fa75---3829627465.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/a35832c3a1ae52286b60c6846ab3e06e/meguvamuxuxuduvuturumi.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/63539196243.pdfIn PDF document text
    • https://argumentua.com/i/file/11410788224.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e97a168fe5---vegekatolowosusimanurunes.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aba171bd1d---pofukasosu.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/zudumeboguwufolewumuri.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/77654741869.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089845e48db8---fosarepopumakozewukule.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/71126423336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=motorcycle+endorsement+study+guidePDF 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_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 16284 bytes
SHA-256: c122f329c4b976c5ca295b7e8d9bbb897fb68a3fe776af31cc78987ce0e2b6e9
font_01_sfnt_off00011c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 10756 bytes
SHA-256: d9f8998819e488cb0b5804fd8a07d793ebbc392a03c9bc55a903b3dd0ecb8d66
font_02_sfnt_off000134a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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