Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c7462a4d5a4240…

MALICIOUS

PDF

95.1 KB Created: 2021-09-13 13:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 839cf8bdce4abb2608b54d897ac55dc5 SHA-1: b17a243268ca5fb509ef58f5f7f4ca1b8f4fb1e5 SHA-256: f4c7462a4d5a424076e77199883754635d7d6a4049700bd68848731fd1c709cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • 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 http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/54848403369.pdf In PDF document text
    • https://turdv.ru/SITE/files/editor/file/dasefedojopub.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/wosenekeduxopefejilusofu.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/janijixiv.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/pabufukipaninezoxaz.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/77868683942.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/tokiwu.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/83832068168.pdfIn PDF document text
    • http://lawngo.net/fckfiles/78259974520.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/75113631008.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a36a3e7abb17d0dd5aa18c97a2ec08c4/55893319825.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/89593548088.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/texiliwewu.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/viwofinapo.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/pezewu.pdfIn PDF document text
    • https://bawauang.com/contents/files/powizagipo.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613668a096c37---5726466274.pdfIn PDF document text
    • https://whitesal.com/data/images/file/4909_20210911184658.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/15998455713.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/lisafilu.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/65335698011.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210904_004911.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/4uk195v65l38pb5h4sl8klh55i/tegegud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=demon+slayer+mugen+train+watch+eng+subPDF 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_off00010a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A63 19140 bytes
SHA-256: c820c9a66199b37b39be8c76b4c64a0f62bd9b59dda72d122ad417c5eb911e3f
font_01_sfnt_off00013cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBC 11120 bytes
SHA-256: 9e5fe00e82bd8b9131f425e6ca7c7aa667f1ef0273acd265d5e5b4dfef3c8ea8
font_02_sfnt_off0001569a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1569A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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