Malicious PDF — malware analysis report

Static analysis result for SHA-256 33dfd2122ce529cd…

MALICIOUS

PDF

73.5 KB Created: 2021-10-09 13:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a7573ee0c690080ec0f91f126f4d0e2f SHA-1: 1568eb6da7cd3e631a7cf005683911dc4c46d0a1 SHA-256: 33dfd2122ce529cd8b5befaf746db16dd846c657a5ffd3934f49deeb04fbdd66
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The document body is unreadable, but the heuristics and URLs clearly show a pattern of hosting malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://arvikabc.com/images/uploadedimages/file/88555550081.pdf In PDF document text
    • http://vinaaquachem.com/uploads/files/29896706582.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/giluveninibukefu.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161474209be875---59346968696.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/1367765592.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/0843547c0614c32321eb3f4f7292d326/29087222578.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/xaxasuraxanigimolevujazew.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/denuperujafizerav.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614df4400ff02---fimimilotuso.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/55813205690.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/nifiwukilunilevubupawopor.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/4071558644.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ff9584d27e---14266092055.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/802452399.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210908063233.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/jesomuk.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/29903290205.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/xozakajarapalav.pdfIn PDF document text
    • https://funstore.dialog.org/userfiles/file/88119660198.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89619976839.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/61487256806.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75071516465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=dimensionless+physical+quantitiesPDF 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_off0000bfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBD 10900 bytes
SHA-256: 8e363c3fdd7a9fe948e5b22fec539c6d07fa6ff59fe7b20258e2c31921437ab1
font_01_sfnt_off0000d8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 15532 bytes
SHA-256: b13864480a7ba0dcc49cea37d5c6e34245a91fec331c8a0ca65b2a5e0e3fb5aa

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