Malicious PDF — malware analysis report

Static analysis result for SHA-256 258bfef0db5690fb…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 18:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d20dd6203289ced1adf9efb244881f75 SHA-1: 1d32dc142a7880e7fb057990eabf5fad5459e515 SHA-256: 258bfef0db5690fb498f91c86ac6e89371b0575c99f79f557ca2083e1d0d0eea
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics and the nature of the links suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://zagazzo.com/userfiles/file/pewixumidelibiteloperazuz.pdf In PDF document text
    • http://eventechsite.com/files/files/87355169581.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/50280497037.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/budazo.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/noladibapej.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/fopagowupawilefezebifuri.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210907_0C5D1F98413F774C.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/3170141076.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/guteler.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/gimupasuxaresejovunotum.pdfIn PDF document text
    • https://norservis.info/files/files/84359287964.pdfIn PDF document text
    • http://citra.cl/userfiles/file/96824751439.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/74041775520.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/dobosuxuw.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/xaxibudezami.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143055b328fd---80625377121.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/7879195052.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/zosapukanewapalapomato.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/kiziwunene.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/jusokopafamamokubidoxo.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138bb114b14d---datumopesiw.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161364b791038d---dewabonipumumefokiralid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=download+ben+10+ultimate+alien+ppssppPDF 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_off0000d069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE880 10952 bytes
SHA-256: d7a868acd5a3d353fdcd89d956063f6d36e521ea14acfc1a87cb2b8d31d10c86
font_02_sfnt_off000101b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B3 17684 bytes
SHA-256: 965794f900662efac09a2d65665c77f5dde830b6737c1ba0f3fb6aa35ff1b28a