Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1d9a4734bd85c7…

MALICIOUS

PDF

87.9 KB Created: 2021-09-13 02:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8b97d2b7ae6e288579ec3bf6b57c8d61 SHA-1: 1866a5f20a1725e0598326027f47fe5bbca2c232 SHA-256: 8c1d9a4734bd85c791bdb64b6a48c3f2c1736b36f9e445b2ee18c729bb61c5e5
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.siposferenc.hu/html/jejijezez.pdf In PDF document text
    • https://mwasafat.com/uploads/files/getewapajap.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/lapebis.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6b5644620---50796029335.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/64675809537.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161391f1e294f0---jebevogeno.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ca07bece---7985593878.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/melekipifazozagovipif.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/20990056064.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fed880b50---42391201943.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134697db4dfa---45620560434.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/90589861889.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/1982020227.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/5792736342.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/98013154616.pdfIn PDF document text
    • http://platcometals.com/images/file/rexatezozuletutev.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/zebiwunamotusaruziguseku.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/99987722557.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/wezubad.pdfIn PDF document text
    • https://jensbrode.de/files/file/rufivemagenov.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/zelilinuj.pdfIn PDF document text
    • https://gdaniec.com/upload/files/84728713414.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/72515588719.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090207282873499.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/vupevosatamejokabif.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/86010822742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=list+of+all+android+appsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDC 10316 bytes
SHA-256: 2a7511cc659a2903d9a8e8fa161f0d6ca7b226a3b68eeb1449cc5485908e0df0
font_02_sfnt_off0001242d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242D 17632 bytes
SHA-256: 636d1102a7a4bba83a7c9d81bdeb4100be0a939c4a016c7f38f45fa35978bd5d