Malicious PDF — malware analysis report

Static analysis result for SHA-256 4faf41c6d439a6c7…

MALICIOUS

PDF

71.6 KB Created: 2021-09-30 11:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61a27adb2335373c6d1c9a2e61179f84 SHA-1: 77d3dfc7552bfda7dde8d19d04a116a45cf7700d SHA-256: 4faf41c6d439a6c72721c69065fe642fa0fa03a5894d9b7cada8ff0202f478f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The file's structure and URL patterns are consistent with a malicious PDF used to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=best+intelligent+games+for+android PDF link annotation
    • https://shturnev.com/files/foFKED/file/64807351055.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/6572724481.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/nemebodafexoko.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/55620135854.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/jupojefezekofo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cada03b7e2---palezifejuramixon.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/bodawatumijuxupiponesu.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/finofa.pdfIn PDF document text
    • https://arerp.kr/data/file///14879950936.pdfIn PDF document text
    • http://js-space.de/userfiles/file/vazemurofito.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16139e3abe58d7---nawona.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/semivasasufuba.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137288ed5ec6---85251855963.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/xekujesuditof.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/vufimulosaw.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/fisimonorutunasax.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140a5ba82ae1---ramome.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210926_A8E2F7A3E74B1803.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/86114572976.pdfIn PDF document text
    • http://www.heksan.com.pl/file/gedunexidetafowel.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/mifewigepiruduxesa.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/72087824761.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/19540273299.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/42799460517.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_off0000b382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB382 10752 bytes
SHA-256: 3c59ad81e09adc2824221f4aba5dcfd8f6381567b513b5ff966b6a31b1fc2053
font_01_sfnt_off0000cbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFF 16792 bytes
SHA-256: 3f390abcf54ef2e2d9906c916fbfb1e74b3d6696e3d1a07ace388bb7886c83f1
font_02_sfnt_off0000f6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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