Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6053b26e0db486…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 17:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 458e6f5951f59d23f9511cb678253d49 SHA-1: f71677c2358169c70d25bf37cf538f0e93e990e1 SHA-256: cd6053b26e0db4868097df48d1f470c3981bc6f89b471242e7dfdc50dda4e01d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 https://krisoc.ru/uplcv?utm_term=how+to+open+wrong+pattern+lock+in+android PDF link annotation
    • https://stichtingech.org/ckfinder/userfiles/files/5011224787.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/doxomudojifosijule.pdfIn PDF document text
    • https://amgaa.org/temp/files/19337841272.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161343fc1ba40c---xalafana.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/zixekukowuxokajip.pdfIn PDF document text
    • https://esvigo.com/upload/files/lawozar.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202194335206031.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/24725767415.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/barinibapozafamenezosimi.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/wunomepalazujoxolatijaja.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091107534816.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/64158149287.pdfIn PDF document text
    • http://aa-nusd.jp/33165372116.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/55986317986.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/88438536793.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/wejumejosoxizalixaditutoj.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/39316367102.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630932880.pdfIn PDF document text
    • http://myphamasia.net/upload/files/2239848682.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/supapupapuzutuzokekewu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de639eeb7c---menekazubadumesivogeto.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613f80655968c---wafuxugirapolisatosar.pdfIn PDF document text
    • http://guowangcable.com/d/files/37779190286.pdfIn PDF document text
    • http://webbuilders.com/files/file/82987058794.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/rixubud.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_off0000d910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 10688 bytes
SHA-256: ee841bc120e94f46318692ba699bde84823dfd779c62e6a201e2bbd12381bebd
font_02_sfnt_off0001098f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 18388 bytes
SHA-256: fc203e0ce2215ed8c982d86b91a101bcb1dfec9c7155908c4fc005620aad1fe5

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