Malicious PDF — malware analysis report

Static analysis result for SHA-256 c363b22a6e36ad51…

MALICIOUS

PDF

85.6 KB Created: 2021-09-21 18:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 61f4c38c38d399ddc504cac21f8ac085 SHA-1: 086a343374a2b83b23da533471579e27d713ba4e SHA-256: c363b22a6e36ad5114e5ee19495b418751821992e29adf6007119b7b0c17b069
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://dwitunggaljaya.com/sitefiles/file/64136931560.pdf In PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfb20cc35c---dugazezul.pdfIn PDF document text
    • https://membermimpi.com/contents/files/32015883474.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/90f0da030b006fbf4ee3fd2a42d69b2f/pusifoduxoxojalaginowuvul.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/tifubezelafebit.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/15962000763.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/33583433037.pdfIn PDF document text
    • http://podarox.ru/public/files/wafutepusaweka.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/lesexikajejejaxosono.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/fikaxebox.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/61482724388.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/70012719744.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/30844192643.pdfIn PDF document text
    • http://runhouchem.com/upload/files/88142710250.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145668daaa39---39028042096.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/popibipomorezinun.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/suvofotibu.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/zudaloxarugej.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/48994620109.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/98160109623.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47195091648.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/3350343141.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/74077849796.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/95668697405.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f673f0a81b72216efe7f2a0139e6bf30/lidolabavomipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=download+hack+version+of+hill+climb+racingPDF 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_off0000e568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE568 18928 bytes
SHA-256: 9040877592574be9bd3a43ebb5be5cadba1c027de9c7ffcfaa1900f4c6d181db
font_01_sfnt_off000116be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED5 11208 bytes
SHA-256: cbfef5701ee86b552509bf95dd3ac3c57e39d6fab281740354fa65a2729f3b83

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