Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d90953ec17734c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 11:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c66f452d0cabb0bfa1c17f00559b78db SHA-1: da2dd4b437ea2973863230b301add98362afcc9b SHA-256: 80d90953ec17734ca2dc1d8c52eaeeb0cb6a6e3f448d2242cefff0072f75689b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised CMS uploads and disposable hosting. The presence of numerous links, including one with a 'kissanime download ios' UTM term, suggests a lure to external malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://enjoy.sk/editor_uploads/system/files/95229890123.pdf In PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/nanajiravetezomisewaga.pdfIn PDF document text
    • http://orem.mn/uploads/files/nuxufejasorukupada.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/guxumusalogejatarakux.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/zotebiropemifilemenemekil.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f54f4d8b66---4410854787.pdfIn PDF document text
    • https://stauber.lt/images/files/siwasi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cb6864fd7---85641959156.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/46086923504.pdfIn PDF document text
    • http://inphilong.com/upload/files/salinezik.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/60200104011.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/12469194523.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/80684470865.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/jobusasef.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/87687025894.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/banodixidujivobemegalavub.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/mapeginumelebitusidex.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/35032692542.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/45378182381.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/10229200482.pdfIn PDF document text
    • http://spbi.cz/res/file/xezuxarotudib.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3fc02587---75418332643.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/60128336450.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/7873e22524ed3df78fb53c907fa9c631/rageki.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/gapuwinav.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/zofaxigolegenadofijivog.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/040311438581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=kissanime+download+iosPDF 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_off0000dbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 17376 bytes
SHA-256: aa9bcddff6362042d9c1be5baa3817306d97b547dd7a36e6e7c866410bedb108
font_02_sfnt_off0001205a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205A 10288 bytes
SHA-256: 8ec7f2af429b6b79914933684e67d3c01f303b16507c01385e82a53877e2df93

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