Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a1c2ea35079521…

MALICIOUS

PDF

75.5 KB Created: 2021-09-28 23:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3322c0cbc927876a7ae131788f1ffd77 SHA-1: 0be206dd111eeac2b680d09a1e03102039385b07 SHA-256: b0a1c2ea35079521f5fb8b7c7b42ebeb5eec3d298eceb0d92753de535c6c0301
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ceccarmaramures.ro/userfiles/file/14802126613.pdf In PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/govujomevikinuzojewaresi.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/28813555761.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/38143162212.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/34f85301e9c6ee94bb4969df240bdb16/2570176172.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631201531.pdfIn PDF document text
    • http://4rrecycle.com/files/file/40281948653.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/67214803360.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/93060309441.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/fagibajinujawulavu.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/33258496620.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/16694536348.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/xajiwenozun.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/39f927f187ac3026a6a0e38a7d13cf5c/bekedalolukomamip.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/27671245791.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/38555593093.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/78486081084.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/fizopefufugi.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/xibudawibujupupoporoza.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/siwapexafitomofizibufiva.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/xivut.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613910ced92cf---65740305055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=tasha+cobbs+gracefully+broken+lyricsPDF 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_off0000bd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6C 19032 bytes
SHA-256: 4d1a9be13cf6d898f895dc0f1657bacdf955928f770862811461b681063ae988
font_01_sfnt_off0000eeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 10924 bytes
SHA-256: aad4e46bdca0f757c792eaa80e4838f6059bf49f2a7199f16b6fc3d65238d65e
font_02_sfnt_off0001083a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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