Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b911304b95079b…

MALICIOUS

PDF

85.0 KB Created: 2021-09-20 05:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2a4670c6063e788aeafb0dbd3c3c0fe1 SHA-1: 775ed32a2ed63aaa9e1a4c61b23e22319ed7c6d0 SHA-256: 15b911304b95079b7eabb0316692e79873eb8f73e7eb585e602435b652309d16
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to domains associated with link farms or potentially compromised CMS uploads, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the overall structure and URL analysis point to a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/nerudeg.pdf In PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/15658845108.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/22557570118.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/bidelemuzedokezujat.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a2924ff2b---rinitidorelivebeboworixuv.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/8667855957.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/womuxolifetufibajuzij.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134289026ee4---mumitowujamig.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/rikabevos.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/40824787970.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/mivowugaj.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/igadewewevakona.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/41065246222.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///48848552710.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/56295477003.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/32761569523.pdfIn PDF document text
    • http://grotech.in/userfiles/file/13676335467.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/velajovidatapovoduj.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/70e85236ce63584022ead8321a3387bf/35162958580.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/fojak.pdfIn PDF document text
    • http://asvpp.fr/pdf/rewakewakowuva.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/zuxosusadulixa.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16144d03b5e0d9---firibufafa.pdfIn PDF document text
    • https://asken.as/bilder/file/naguvesikeb.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/68371329898.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/rokapurafusuzed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=note+10+plus+one+ui+3PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F2 10404 bytes
SHA-256: 88f0ecd3ae635bd3af24f07d23b5390e2c12ed398ca2df214a131ca6b7273342
font_01_sfnt_off0000e1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AE 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_02_sfnt_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 21272 bytes
SHA-256: 6243c573c27f26838637b59b805ca2aa97d3b68392ec2f2085b4b39641e94c82
font_03_sfnt_off00012e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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