Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b4ca6cd0dae152…

MALICIOUS

PDF

77.0 KB Created: 2021-09-30 19:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c3b22b5828a2cd11e0c52722fcd41ff SHA-1: f8b9a0962f847b3190aba12f826c16fdfabe8db1 SHA-256: 38b4ca6cd0dae1528f468e99e0de07143f824363b4cb7bb2be6afa3fa1e02bb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised or disposable infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While 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 0.9908

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://nhadeptannguyen.com/uploads/files/89307114012.pdf In PDF document text
    • http://winso.tw/userfiles/file/92050650582.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/zutabav.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/11690154948.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/novupadinagonenized.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/pudawamiwi.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/nubisabagigipujipimivuzux.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/50643758714.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/37212906836.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/73b3beb8b42ebf89e167df218970bf37/11269169941.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/zubivoridifokosutopep.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161410dcec90bb---79498679183.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/fezelaxurof.pdfIn PDF document text
    • http://vhktn.at/images/content/files/83441413420.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/68055548353.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16153d9a7d3d93---42782494888.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/lokajidujomonipiboku.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/61153912762.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f7d942690aad53b4bae0650b07b62fc3/6248049322.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/kunanejotogademegonimunax.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/medopawamolizawumimuxa.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/85965356825.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/sisolijolemipodax.pdfIn PDF document text
    • http://stevis.cz/files/file/pevef.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/sanefijawagafopej.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4c1b4e9fe---34142139839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+amministratore+dispositivoPDF 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_off0000c0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CE 10552 bytes
SHA-256: a21bdda738ac06f40d86a54a6cafbd01b8b337d43421f83e48bf53cc235baf89
font_01_sfnt_off0000d8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DA 20400 bytes
SHA-256: c9299043add8776f271155ce1885cbcecae1e165e79f56963458b39a73532bf5
font_02_sfnt_off00010d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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