Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c3ab964f90f509…

MALICIOUS

PDF

83.0 KB Created: 2021-08-28 20:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d02f1b682a6ec5d042aaa9347754031e SHA-1: 5a6292efe5baa14bca8631161a8c45a6ea9c44cd SHA-256: 56c3ab964f90f509a3aaa69820615e7a35b2a6728daa41fdbec33b3b82fc8fb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, with external URIs containing 'utm_term' parameters suggesting tracking or phishing. Although no scripts were extracted, the PDF structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://infrive.ru/uplcv?utm_term=citing+online+references PDF link annotation
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607425f17ebf4---11102257490.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/wezupuxapixoladakez.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/gasubuxexitojut.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/rvhobk0lbpk5srgj3gke9r67io/zokud.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/40852270266.pdfIn PDF document text
    • http://taxfreepoint.com/file/xadinolevavenarun.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/sareroj.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/94744779010.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/20100799854.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/nudofojomegodokeweto.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/39647432041.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/dotewu.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/hdr7nmec42g43uc5ji9qks12es/rapiniruja.pdfIn PDF document text
    • http://plncse.hu/php_data/file/wikefodujuwomalowukekisen.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/zigabawal.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/aad34fc1c49d90b9f20d08e0cd4e9e35/3645121906.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///2021619235465808.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a147380f99b---55143207411.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/dasatogeriralaxe.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/35205684317.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/mudubeguxezinani.pdfIn PDF document text
    • http://hnspkjx.com/d/files/xoxazedosutarimogaxuter.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/9391821425.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_off0000de28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE28 10380 bytes
SHA-256: 272b7501148efa568fa273a9c36fc1ce6aefd4717d5b06f013ec8588d88841b5
font_01_sfnt_off0000f5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 18692 bytes
SHA-256: fdcc7aec46d21c176e39bf9ccb376a262ea0155c2cf5e482a84c3b255e26bee6
font_02_sfnt_off000125fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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