Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ecdd92ccebcd7f…

MALICIOUS

PDF

71.3 KB Created: 2021-09-13 08:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1f9943e10574ec1e6a6295eb223cb70c SHA-1: 73a2a86d5f54b3b3b58e494eacfed6a6609a5624 SHA-256: 31ecdd92ccebcd7fb1bdec97572f1a329fff41e7b9932e7b00a10e3eb5ca1893
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, particularly those related to 'file download', reinforce the lure of obtaining a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379fbe4ae72---kajebiwiregedunaguge.pdf In PDF document text
    • https://fleschimmo.lu/userfiles/files/sunifozategebexobomi.pdfIn PDF document text
    • https://satesayap.com/contents/files/98784380814.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210903131012.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/32233548066.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/56890032962.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/1db6cd5b967dc36628d139172da448a7/bosunovataso.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/97308347305.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/68803643914.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/68047579416.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/mozokitosobovibeju.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131abc266338---buwosilobejimuronerigiwer.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5a46e197---59690872518.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/womufev.pdfIn PDF document text
    • http://tayles.com/uploaded/21398826247.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/busubujuzosevetitusomevig.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/loboripagomafike.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/bomuzegipoxuk.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e0c5c92f4---xidarituwox.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/rapubezumamoxaluvukesupi.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/83408713133.pdfIn PDF document text
    • http://blgjad.com/upload/files/puxajatogarazupuvitaf.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/zomuziru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fifa+20+speech+file+download+for+androidPDF 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_off0000b351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB63 16716 bytes
SHA-256: be878676fbe77d5de303ff84387fb2441fc2e1d1b5a48311ef3035838153b1bb
font_02_sfnt_off0000f6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C9 10924 bytes
SHA-256: fc8c8afed2553f68a228837e4a64130ab197b072c95e3cbd3fdc67a7865deb36

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