Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21a065aad503724…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 08:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8355cbbbecbefa3d9739862ec5ebb0fa SHA-1: 0cd77232e9d5250f4feaf042073ff4e73f949238 SHA-256: f21a065aad503724d96b2b648d72484f8b8e376cb47dc21c82f2fbf74580c19b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the overall structure strongly indicate a spearphishing attachment attack pattern, aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=how+to+draw+a+barn PDF link annotation
    • http://pop-around.com/file_media/file_image/file/tutarevisisalomorazoze.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/85908141289.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137a56b88905---nunowelakoj.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/76778098635.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/80376487567.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161412d07114c3---zalometifuwamedowalakam.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/zidopudexeluwof.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/jaziz.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/nosenogotesevamotov.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a064155d45---busijeja.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/98635759762.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/xaposona.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136683e1fe8a---risivasobutok.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/89908488536.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613610aa5f268---81238633644.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/tevipusebinenusujazikutir.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/86501004569.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/bogimajamifiwopiludosuso.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/nolozililuzud.pdfIn PDF document text
    • http://varvshistoriska.com/file/nujulaweb.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210907110006.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/43113578612.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312216b4323---vapixujaribat.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210913114527592639.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f9d7be0523180aa62dca1a875c4ed30c/3638726658.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_off0000dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 10020 bytes
SHA-256: 418f85381dacf9a43252407094a83dadff0b524d553917286577ea3a987be433
font_01_sfnt_off0000f2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D3 16856 bytes
SHA-256: adaad21d09888a10b740dbbe6f3454cac255d2fee7ad3d83669cf81b8e9fecb5
font_02_sfnt_off00011dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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