Malicious PDF — malware analysis report

Static analysis result for SHA-256 0173d89ad49f30df…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 21:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b64786702d7cea6ac4bd47b53f97e5b SHA-1: d4e2594ccff0071d2c8a216f26353f5b158c707c SHA-256: 0173d89ad49f30df5da82d0bc98a4c667277de71f039bfd6f7e56e7ce9535131
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are hosted on compromised WordPress uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://smidgel.ru/uplcv?utm_term=kgf+kannada+full+movie+online+watch PDF link annotation
    • http://jingluo.net/uploadfiles/files/wudiwezegizilepimisajo.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613eab5e461f6---9135113182.pdfIn PDF document text
    • http://air-con.ru/upload/files/magefavemupavuxipesusapi.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/31465988783.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/fodabegodofotosapivun.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/jogipe.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/29495717197.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/jurifazabije.pdfIn PDF document text
    • http://artospace.com/pics/file/lowelimokabufepuvesa.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/piteputamozixe.pdfIn PDF document text
    • http://findacommodity.com/upload/file/reguzufax.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/49477916416.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/15147748380.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dabc36229e117080a1fe1f03d2e24752/fopinodojad.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630827892.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134db2f5a2a9---togiruxibinavarujid.pdfIn PDF document text
    • https://pixel.bg/img/file/58406721802.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/i4eul47oqvdl1k97efaii508uo/37388491321.pdfIn PDF document text
    • http://4rrecycle.com/files/file/77195401947.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/pefupenuzevedukevidisiru.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/84427164661.pdfIn PDF document text
    • https://limsurdua.com/contents/files/kibujibixodafa.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/77007409361.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/72245385951.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/kugitivep.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_off0000e187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 18016 bytes
SHA-256: aca70c15caefcc20d2241e5508d8bc656f99208d2bed86e696917ff564efab55
font_01_sfnt_off0001102c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12843 10992 bytes
SHA-256: 6ebcfff84d7318d791cec38f99abe326325dcdbad6bc565bd68023400f1b87e5

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