Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8ccb25f3e3462d…

MALICIOUS

PDF

69.4 KB Created: 2021-10-04 00:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: aba754699cb480d74d38432c1e15c621 SHA-1: d1297afdf5cf3c1e2b253c26e4849b8977132d2b SHA-256: cf8ccb25f3e3462dfc5fbf4c021d39a4fe6221b99ea73e904abb7b996013f182
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to external resources, many of which are hosted on compromised websites or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on such hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://garglob.ru/uplcv?utm_term=cell+biology+gerald+karp+6th+edition+pdf+download PDF link annotation
    • http://dienlanhlongan.com/upload/files/tejilotejujamubexibo.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210927_BA9D2F0ABE09E3D6.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/67735567151.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/29207158720.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/zepufuvofavokedikufiseziv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150964b8543b---gimisa.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/84690660859.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/jomiketebolowagubiv.pdfIn PDF document text
    • http://puisan.ru/uploads/file/22634659040.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/govopapese.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/kulonegogipenedanimopa.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/popijekukeguvirumifake.pdfIn PDF document text
    • http://ud2-140.com/files/33698322467.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/24870152631.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/76409448048.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/gunosafopu.pdfIn PDF document text
    • http://tchid.net/userfiles/file/vajenafozepawejademe.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/jolazusokuxudulobiposani.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/zudarisigituduke.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea690c7bd9---19910829877.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/fidox.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37890521500.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b6321ccdd962d680d6c61021ef92d5fc/pabaru.pdfIn PDF document text
    • 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_off0000af83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF83 11240 bytes
SHA-256: 3f6224b0682c8c9332bbddb5c0f300146ce9e0411d2e799c878f9b6ffe849543
font_01_sfnt_off0000c983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 15168 bytes
SHA-256: d5163f02521eef5b819d5050ac4d9543d0badf28eceebabc3de8ccb50a023246