Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f562473c38eb0ea…

MALICIOUS

PDF

101.0 KB Created: 2021-09-19 10:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0d5980a07a0bddc54c1f3293ad8bd172 SHA-1: e281c486a1afec6facb693858e662ad82edde91e SHA-256: 2f562473c38eb0ea2465c3c24a6f2fca2f64f6f5ebd7bc799496f83f6aa234e5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external files, many hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df8f9143ec---losat.pdf In PDF document text
    • https://incoyun.com/calisma2/files/uploads/32761569523.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/wiriralefixewumulupirumew.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/85703378885.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613baa9f4d5f6---folanifoxaxane.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/zemipudufu.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/sezagiroletugovanazobedeb.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/56664447977.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/nuxakazofudepinufolamefum.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/53840672355.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/rowiluwugizuxemikosenomub.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/48968542387.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/83955294755.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/29851178706.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/rolizufobok.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/75179052953.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/zulodojepupo.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/21094013427.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/50537999383.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8c992b6062173d8d6079fb62211ddc78/61353366355.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130377c0f0b9---poxasosum.pdfIn PDF document text
    • http://harlit.com/upfiles/file/38890614810In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=programas+dj+para+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_off000121fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0D 21188 bytes
SHA-256: c09614503a3abe170136935aba5540ae3678ec334dab5636596b54c5be018b65
font_02_sfnt_off00016e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E8F 10592 bytes
SHA-256: 500fa087ae6bda9fe595c2556b0fc0f838f97151faa954fe33bca019cde74029

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