Malicious PDF — malware analysis report

Static analysis result for SHA-256 a898751373a89444…

MALICIOUS

PDF

83.0 KB Created: 2021-07-02 12:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a95c26ee681ed5bde96d8f2cde114d77 SHA-1: 432a8ddc87db10946479752292079054ec80c2ed SHA-256: a898751373a89444828890d790f0e69fd9a53e06fc3fdc54f446afdc318740d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a "download button" heuristic and a high ML confidence score further indicate malicious intent. ClamAV also detected this as a phishing trojan. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

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://coretry.ru/uplcv?utm_term=common+and+proper+noun+worksheet+for+grade+3 PDF link annotation
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/d39138cfc5b6122cb43a927da8bb3f83/41017757446.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/8d3v1jm99vilf58q4409sm9jg7/6045470669.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/vp9md7oi24ocrco16dcichppr4/59256810838.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aed2155d9a9---razuze.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/cb8627100b21b509d4fb5aa803087ad4/zanupexukenewa.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/vabuvogokuxijudara.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/fatipadofaz.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/jesijikisuxuwudanukak.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b732ec5bb---bekamosagek.pdfIn PDF document text
    • http://imaginove.eu/data/Files/lurumivowegufowakajo.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/nolaro.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/de42f9ee5988c15e220d2a191acc18a9/dajinaf.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021061601383566.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/qfprs8qee06gve7s092klcgc06/pasasutiso.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607731cb348f1---89339961067.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/57099704269.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216172232477429.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/2202068441.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210628144616.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/9a74031c9ccfcbbe6acee6896f5804a8/87801640005.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a481c54ba88---38913867826.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/88757630ba7888061b28b8d1fa01bf08/lanisalevegezimebakuxip.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160756c84ebd8b---telavika.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_off0000e087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 11288 bytes
SHA-256: 35e406ceebec925186691496012e9bf876bbc6b1ea92dd9249edd32c3a4c93d9
font_02_sfnt_off000112de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DE 16852 bytes
SHA-256: e2f60a7ed2ad93204066a0a29e83a49e6eb7aab574726b50396c0edc828e4e47

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