Malicious PDF — malware analysis report

Static analysis result for SHA-256 276640fadd243937…

MALICIOUS

PDF

74.3 KB Created: 2021-10-01 03:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8057ae78226f95a67ea76faad2626d61 SHA-1: 0c520fb1d79d4112770af2f78c5648200170ed02 SHA-256: 276640fadd2439374062186ccc61617ef22f78a99fff81f7a26924246197b7dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with many links pointing to disposable or compromised hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://www.tivafa.hu/upload/file/fidenoredatafikabuwoz.pdf In PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/sumazubegopuvirelubesano.pdfIn PDF document text
    • https://crv.dascalita.ro/app/webroot/files/userfiles/files/bozivupum.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/92256588657.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/08c5dd49c2e7bdc94301ff02ad76cc50/84804275666.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • https://campermagazine.tv/public/file/mofifojesofogedata.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/nuloxolivad.pdfIn PDF document text
    • http://samtekelektrik.com/files/84863608931.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/difibasaru.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/48028536366.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/puxikuv.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/25021538868.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/gilevegupewedev.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/30089328462.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/l1u2ag0ltan7mc3mvh2pd97h32/xixexawotigexa.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/54f4e86bd8d4bfbdd43f6c8e9b5636d8/80038693312.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/30519602854.pdfIn PDF document text
    • http://3q1p.com/upload/file/210903123113712626aptvdhxgkw5m.pdfIn PDF document text
    • http://one9five.com/userfiles/files/90321456373.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210911_201402.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/gedakudaf.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/90646465547.pdfIn PDF document text
    • http://didopack.com/files/46052722276.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/24/86326660710.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a95c4c9f79d50af5bc1431940b00fe05/riguwoxet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=download+text+from+android+phone+to+computerPDF 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_off0000bb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB93 17924 bytes
SHA-256: c672c6f993e645cc1daaf984b6cfb1c346f9eb035a978c2a4ee5c18af51860e8
font_01_sfnt_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 11008 bytes
SHA-256: 58e5596f060229aa0e5754b549148ff5bfc29941830710564f26c20da534a77b
font_02_sfnt_off000102fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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