Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b02bb245b4198a…

MALICIOUS

PDF

78.5 KB Created: 2021-09-05 04:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d423271f553d8fb89d1b3f64cfd0c6bc SHA-1: 1368b6262e26dd9b70f910a511ecabd802112659 SHA-256: c2b02bb245b4198a806a6aad8c85bb97055f2c43c0d93a3f0d4fe473b8bfbce6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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=three+phase+solid+state+relay+with+zvs+pdf PDF link annotation
    • http://fournitures-reliure.com/prod_files/60485722084.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/sivariwewujopuxetiwuziso.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/pujun.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/dapujekesamefitasaxim.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16126ce09d09f0---59261784950.pdfIn PDF document text
    • https://anjingliar.com/contents//files/4022922530.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78f905ce29---52216393260.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e1956a914---732205075.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/047f2cbdfab3cb49284c20d9a1c8c0a4/8959363932.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160da1a85f17f6---8741246310.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/75223833574.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/14294631460.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/sabelutuf.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/13507200533.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/043a19f809b6df4ae96c3bd752fb7541/42286670052.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/17773866775.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/21703568894.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe42604dd12---37586827155.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/xozipekomusikajenefep.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161173ce057a37---tipuguzizoneput.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d468c5758---dofezezeba.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd420643f7---52540277273.pdfIn PDF document text
    • https://somogyplusz.hu/files/kototafulakapakamexemefeg.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000110b1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x110B1 17772 bytes
SHA-256: 1c09de7441af07832a69d8b83faa8a49ddf398336887e39df342fe3e31ea4284
font_00_sfnt_off0000b63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE50 16240 bytes
SHA-256: 3835be52be78c14880ceef6e4cf285a5b2d4a8f220dcdac369b34a07eb726251
font_02_sfnt_off0000f7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 10780 bytes
SHA-256: 22f087306fba40ba016de498963c73bbc1331709e04cf0cbe146a94b0e3fd324

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