Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf8e4560f54edb2…

MALICIOUS

PDF

68.3 KB Created: 2021-09-30 16:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4bf3bfb30ed51ffec4c9ca8c329bd06d SHA-1: 5925aaef42c42590c65dfe3df48b63f5d6585428 SHA-256: 8bf8e4560f54edb2cfd71a92aa03ba2f35a6b95bdf37467e4aafba343e89d334
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for distributing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://chcial.ru/uplcv?utm_term=dragon+ball+kai+episode+guide PDF link annotation
    • http://seteo-dechets.com/images/file/23655169576.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/80615705743.pdfIn PDF document text
    • https://e-room.co/userfiles/file/45586550583.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614926a0bedac---dadojobafefeguzatudojo.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/93050612010.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_05_22_59_58_2021.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/77597011391.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/7653378338.pdfIn PDF document text
    • http://lovesenergy.nl/file/xedukikopidotif.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/nesusifix.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/zoninabem.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/4101142153.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/zebide.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/24125698117.pdfIn PDF document text
    • http://hk-keber.de/images/file/podabulalunozelo.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/fukimedanepukuzufojoluk.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/pafeluma.pdfIn PDF document text
    • http://101balkon.ru/upload/files/20195909126.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/32178525862.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415ca1f1e65---24724778363.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c248441a5---77041721592.pdfIn PDF document text
    • https://esvigo.com/upload/files/77991774872.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_off0000acc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DF 10800 bytes
SHA-256: 6a1ee08f24f46a9842fed8609836d52796028f6a12d0e10dc4a81545cc7c17a9
font_02_sfnt_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 15128 bytes
SHA-256: eed393d7adabeb0bdeb82d3a1d035c4fbdcde6d47fde9bd09c0536ef35391dd1

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