Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdca82ecf6b3c719…

MALICIOUS

PDF

99.7 KB Created: 2021-07-26 09:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fde30d0630d9241f678347571af5dc3c SHA-1: 53861f93c34427b8a2e61ececeae10d62a76e649 SHA-256: bdca82ecf6b3c71935bf53194c02ef85d54038125d2db3ba81a39416a94caf3f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are identified as disposable hosting or potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sunarfactory.com/userfiles/files/10357305781.pdf In PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a89a618a331---dirivepugigexesupuwopebel.pdfIn PDF document text
    • http://ropesadventure.com/d/files/zorukorobapikob.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc585653e0---vigadotekepemoguba.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/fibafena.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/63572211609.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/517735a9d0ce85e2b55f1828092072c2/60648102006.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/19446308573.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/11289155471.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lanovak.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a1b3863cf---piseradapaposexomopawuwos.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/48586439104.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/30083156765.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4981a2a47be7f1b3ec698e7ffc60a2c2/vimifazapo.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/v14eb26r8niirh47amu2m25g25/zolojiz.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160843e7a5a11f---gufozepiwa.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/74956899141.pdfIn PDF document text
    • https://betibg.eu/webroot/img/files/xokemenekuralog.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/44885865529.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c40e6aa2d0---2677709339.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/78522966620.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609476ac641e0---96627968732.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/20s372q57emiqv7lukcdm1k5h4/sogenumakirezi.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/lomofupupigorowanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+pineal+gland+the+eye+of+god+manly+p+hall+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f405.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF405 25120 bytes
SHA-256: f311529ce612cdb45dfd2e2c94e9c82ed90fec43d7cef93a022b033f40e4d6a9
font_01_sfnt_off0001213b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213B 10752 bytes
SHA-256: f7c8ecf32e04211cabfdef35a21c938716fd4c348254c7571f746250c1dc0b87
font_02_sfnt_off0001398a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398A 17504 bytes
SHA-256: 7ab74d84e80ebdd611c6318e432e947e168cf40a62773d153cc5bc95ad9a682b
font_03_sfnt_off00016798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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