Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad08863cd2b8789…

MALICIOUS

PDF

79.7 KB Created: 2021-08-28 21:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 19d8c170d9c802cff1aff478d13ebc68 SHA-1: 7fef9dfb378c12f251c2597036f4c97293b21600 SHA-256: 3ad08863cd2b8789dff072815b38c570ec0ec48e95ff9697bf22130181722813
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f3e053e2b1ddcd2b1e54b6c8aba46a29/54699948556.pdf In PDF document text
    • http://thetestmag.com/userfiles/files/48388380269.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/22450421523.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fa8814da3---menovamiterifa.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f65fcd5801---tuwutabofa.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/sujivezirekuz.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/16059292226.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/mufidiludatevavukidawo.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/26235585171.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/49449707519.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9362198a3---26144695467.pdfIn PDF document text
    • http://chinalabware.ru/d/files/70089981921.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/zubevukigefilew.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210606_4E6FFBC240CB2445.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/gukigaporo.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/xilabetivirosawow.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608922d318101---38362865619.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/iimukuelmnsncjft40g8vq6i82/24370041764.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072bf2e37da7---15162106882.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/87831326618.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/81386253152.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/97584710358.pdfIn PDF document text
    • http://ashioke.com/images/library/File/51064228605.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/47638994011.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/35450324997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dr+ali+cardiologistPDF 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_off0000d308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD308 10308 bytes
SHA-256: ed7f61f1d36c1a9184783776f62fbe19e61ac773a1a37338327e0902dffeb5af
font_01_sfnt_off0000ea25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 17872 bytes
SHA-256: ca51e358fd94539c6db35eb1f92b47f7ef88726bbff46c2cc87c15929f2bf912
font_02_sfnt_off00011890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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