Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd50feb6e799797…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 11:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 76a51bfb2c116731c4b7fa253809f2ab SHA-1: 2534d969c21032b591a6721cc95f60ca78d07fbe SHA-256: abd50feb6e799797adb566dc153832f566395ce196512ccde5ccfe45c8074ca5
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external PDF files, many hosted on compromised CMS platforms, suggesting a link farm designed to distribute malware or lead to phishing sites. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=super+smash+bros+2+unblocked PDF link annotation
    • http://mingzhicc.com/userfiles/files/besagugusot.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/99618459239.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/76421828152.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210918_E32AADB2ED2B532F.pdfIn PDF document text
    • https://indiansecuritisation.com/ckfinder/userfiles/files/tezilagawa.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/61496898542.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/57807216928.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/90263300560.pdfIn PDF document text
    • http://ombs.ru/uploads/files/83798355012.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/64422919926.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/2b6c17e29f148ed4c4383dfb2d3c7e5f/zokonu.pdfIn PDF document text
    • http://ymmicro.com/files/files/fuleletadanubuton.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/sexin.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/46397665739.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/tuzujesisojuxepime.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/f1ae1dce233ad27fb910a838c861db82/31911803046.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/kidutud.pdfIn PDF document text
    • http://koddous.com/userfiles/file/33943931008.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/f8bc95bc04cd3994f91403dd333c7187/8593887112.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/13204736581.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/40853966416.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/12068300586.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/4324069803.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_off0000d2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AA 11116 bytes
SHA-256: 0b9fc198945ff3694ec6134a1e4b943b9784f7897f66c2063dd87ecfafa95baf
font_01_sfnt_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 17540 bytes
SHA-256: 55d97af86a5d91904e2e27df40215065dd543c3ab4f0acda47243bf548238ca9
font_02_sfnt_off0001197d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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