Malicious PDF — malware analysis report

Static analysis result for SHA-256 13bfc16f9955fe1e…

MALICIOUS

PDF

89.6 KB Created: 2021-06-25 22:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2aeb73e46d8de811ec7c8e1ee3b03cf SHA-1: 8b38c1cb83a7f4c12e65ea5b90390ce49f545242 SHA-256: 13bfc16f9955fe1ec2916d3777efe9f855bf81f56460491a4d22f2545ae8842d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for redirection or exploitation, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://cintabogor.com/Uploads/userfiles/files/40076410971.pdf
    • http://solee.cn/ckfinder/userfiles/files/ludafopojepumuku.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609abd5800025---98165207689.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a02964cc466---rosejejurajup.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/4789668577.pdf
    • http://sevimticaret.net/userfiles/file/48206654743.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4c2c1ea847efae02550facb3fb1fadf3/31924132101.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a76701556---47742498611.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/14950feeb25d899b4d6b9164e78279ba/jupunusaja.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/35264375873.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae533c6f45---pakolugaxu.pdf
    • http://kardelendalgicpompa.com/uploadfiles/file/44917160953.pdf
    • https://taiwancy.com/app/webroot/userfiles/files/wereme.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/rb1qsah3k8dqiojovn87e14lco/25234468501.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160866b4366d38---vujoxuvepofonudovun.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/rdkd9ekh463jmoeetdb2nbein2/tavinukaxixitat.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/mugitenarupaf.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df6945af48---nezefaxepexolusomurixo.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a5ec718a1---gozifabejedepadelobe.pdf
    • http://goref.ru/files/file/81950338004.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609829b32e27c---gofifajasav.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607afec54ecbd---61148156860.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091f6c9df9b0---mevodu.pdf
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/wepesejovizaguz.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec94643124---nerenavigifalobitelog.pdf
    • https://ncvpte.in/userfiles/file/21899531600.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/aef4996c3733e4f49cf97f996e9da684/12973071861.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=systemic+arterial+embolism
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd51.bin
5af3a6a446cd80642ff636f2d358c99f27e9241beaf4a68f963f92468036947d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD51 16752 bytes
font_01_sfnt_off0001289e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1289E 16792 bytes
font_02_sfnt_off000140b5.bin
aef0f14d90c14de7e3e529b7c7ce7236cf02b5f6db7ace48d5bdad40d86939cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140B5 10616 bytes

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