Malicious PDF — malware analysis report

Static analysis result for SHA-256 67277e0319a9c45b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 14:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 82b9331fd0213b5589078af43b0cc505 SHA-1: 6e1ab21ee6ff8a7e0098d91d3a8a562e6d967a27 SHA-256: 67277e0319a9c45b22c491f28742320abe3941b8c326f4be3fada0c33a981a61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://soechi.net/userfiles/file/13748052135.pdf In PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/rogixo.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/sotilozega.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/bazugonelagokolojiribeve.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/devoruvugelaladazogekur.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/45925524519.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/setekupomexemedoleke.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140edc922489---tujunozed.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/xatemizixutes.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/96761033313.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/26428471242.pdfIn PDF document text
    • http://e-sheremet.com/img/56493020845.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/5486724237.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/desafamarezixirutari.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/60258488146.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/11667270449.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/49214161203.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161306602e85b7---12800847743.pdfIn PDF document text
    • https://naves.cz/res/file/vufejotefelobefikit.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109131749521159.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/16306832932Sw6.pdfIn PDF document text
    • https://msiutilities.net/documents/27824896023.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/nopafafinelolivuninunu.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd2fe9c08e---gejugujuvigupozuzojujalet.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/berubotixabuf.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/riletukenugumiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=jurassic+world+alive+unlimited+moneyPDF 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_off0000d8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 10888 bytes
SHA-256: be88c87751c21f28aaf8ca05d2b641792518c18e73977bf100242f08ef65bb78
font_01_sfnt_off0000f20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20C 17680 bytes
SHA-256: d1469333d7d2b1715454932d70a2ad49926e08974b3b682fe0d0b2a48179ce2b
font_02_sfnt_off00011fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1