Malicious PDF — malware analysis report

Static analysis result for SHA-256 31681c4862820cfc…

MALICIOUS

PDF

72.4 KB Created: 2021-09-18 13:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f0ac3c1221746013c9e4051a66a53ae7 SHA-1: bb6df3bff116eef7657636d541745c15a2d29d95 SHA-256: 31681c4862820cfca4dfa6331d68408d5f860e3bc6499b9edbdb676d262e03a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=usha+jaganath+law+series+pdf PDF link annotation
    • http://vinmexindia.com/uploads/bixijovoboguzukomimakog.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/dipamovusabaw.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/87727754282.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ps0jii7c34871que78q2439sbl/xulemowan.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/71039382903.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juzobedepu.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/poluwipodov.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/lapaxatogip.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/99750607752.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140465a032fb---nefuj.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/17193565551.pdfIn PDF document text
    • https://orrizon.ru/images/file/kogajuwuselagatixugidese.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3a2d8eea8---miwugutuler.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/65586257000.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/tufevusaxoteririxuwame.pdfIn PDF document text
    • http://www.sczct.com/up_files/file/lejebemidomadenakik.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/dosafap.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/83243886272.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/3690a89c294f82e2508143237926c054/nelis.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/17701470599.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/06949c873e6db5cedff3b5d7fb6b6ca0/resuxitafix.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/86692135015.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/wixugaxun.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/jumor.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_off0000b95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD171 16344 bytes
SHA-256: 32d49e9ebef311ff6441e219f03da357459773d5de009ac86c461d10121f9ea4
font_02_sfnt_off0000fb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB74 10880 bytes
SHA-256: da76d18e2e3ef1b8835d7974988a5a158d9056b954dc03dceb0c86eb38d0373e

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