Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb96d751dfc77c96…

MALICIOUS

PDF

87.4 KB Created: 2021-09-15 11:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 299914c0c79429907b27bb58f6dd223c SHA-1: 81666663c34251465827a7d49b698cf059fe7e27 SHA-256: cb96d751dfc77c96224bfec89f1273575b27735037a419c3d3cb1ccddf5dbc07
156 Risk Score

Malware Insights

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

The file is a PDF containing a link farm hosted on multiple disposable domains, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://zoltysnieg.pl/pliki_wyswig/files/54937060388.pdf In PDF document text
    • http://www.radio-kum.si/data/files/dipukawagidefawuriwobetig.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161419de5261ee---sakatowovupuzo.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/84242281925.pdfIn PDF document text
    • http://zenkatsu.dk/files/saxenipuvirij.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/94229046529.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/fopeti.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/46217949990.pdfIn PDF document text
    • http://datcat.vn/2018/file/85530665098.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/b7751531026f79c624ff28d89f77e163/mubebofepagomed.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/66320080025.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/55103185095.pdfIn PDF document text
    • https://mimpidia.com/contents/files/nimezetanefigido.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/37904364521.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/51955142407.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/11374412537.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161353eea10fc7---detixan.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/18085872767.pdfIn PDF document text
    • http://totoumi.jp/upload/file/zamujebafulen.pdfIn PDF document text
    • https://ismart99.net/upload/files/98708767746.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338fbd39c36---bepilo.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/2bdda2d5522310097e997ad4f148a271/61682318600.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7d274c49---zadepimimidezeto.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/67596238849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ccg+games+androidPDF 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_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 16952 bytes
SHA-256: b11e6fca6bbc54c882698e4b3f0402a7ab9d5b7296a8a4cfbaae6484a880af1e
font_01_sfnt_off0001203e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13855 10600 bytes
SHA-256: da5b9616984ed15a8a31b1d740d40ae833ecd19b53a9df6382fbfe5e2b61732a

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