Malicious PDF — malware analysis report

Static analysis result for SHA-256 33672e7c29a83b60…

MALICIOUS

PDF

89.1 KB Created: 2021-07-07 06:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 2497028fa93774db308a3623bdcdcc1d SHA-1: a62acb11806dcf994dc6ce0d66015f2894b63260 SHA-256: 33672e7c29a83b606dd9e255d3800a9fc24d599e6f990b127eef3ecf7247bd2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution scheme.

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 https://coretry.ru/uplcv?utm_term=how+to+connect+2+pdfs PDF link annotation
    • http://hytechplus.com/userfiles/file/pozatesabodupaveni.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/giridakurumudulanifupifus.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/soresomugol.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a706acd0e1e---86064415792.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966c2654f58---73087605304.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d41957c4---81883961616.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/98167212712.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/fipugogupejinawosugefoji.pdfIn PDF document text
    • https://people11people.gr/uploads/File/rodopezoleminaz.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/lawegezadimaji.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16074fb2296c75---13845169289.pdfIn PDF document text
    • http://demkapi.com/resimler/files/leronis.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/78647722317.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5cet222t8u87050qt9bn3kfln5/65033717332.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/27360865861.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078ee1e0ab77---22584314735.pdfIn PDF document text
    • https://bamor.org/userfiles/file/zoganaxukolulufidezov.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5544fe99b38325d5b0f3bf0c8ac42f66/64358343689.pdfIn PDF document text
    • https://songhong.info/userfiles/file/jaxuvikozizubedisi.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/3841018527.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/27909912469.pdfIn PDF document text
    • https://esz.jp/img/editor/files/90130922150.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf841113dfa---muparagolixulinurax.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2e9f7cea753b07003d800dd204760fb7/88437491186.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607795e1038ed---52916135470.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_off0000f71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 18156 bytes
SHA-256: 217f29fd85ef32799aa91d55bae6b2b2de9abf63ddaa7c66e8515cf2908077a0
font_01_sfnt_off000125de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF5 10412 bytes
SHA-256: 0f09a9b1b18ff68e478635df5809097c538bc7d024367b99a378753c935fb564

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