Malicious PDF — malware analysis report

Static analysis result for SHA-256 72bdeef93a2bab0f…

MALICIOUS

PDF

75.5 KB Created: 2021-09-17 22:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11d206127f3491a562ce74d4e65fbdc7 SHA-1: dbb56c313ce810f2ffe5ec6a986831bc77f7a82f SHA-256: 72bdeef93a2bab0f80edbd2be6bb7851dfc93a77d30f8314bc775d1dbd9e5349
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. The document contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, likely serving as a lure for users to download further malicious content. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to deliver a secondary payload, possibly via JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://hashtag.school/userfiles/file/45199548011.pdf In PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161358582118e2---70049667504.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/e10e74027bc235f93e810de771562c37/wasegakowadiral.pdfIn PDF document text
    • http://glassick.com/userfiles/file/59320797430.pdfIn PDF document text
    • http://thebillionbottom.com/business_school/uploads/file/vomepeberukidu.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/62706668499.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/23123506579.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/38511596559.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/56932286975.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/revad.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad9bc7ab4f---ropodonavekuboxikobafemi.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/88934474440.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109061005374168.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/80759987914.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/larabudebojekipujenitanip.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/18435876871.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tazug.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143dcefeb08f---10689546339.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/xiwituretojitoxot.pdfIn PDF document text
    • https://svltv.in/userfiles/files/xowinebok.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/pisonu.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6ddb01f3c---55440749894.pdfIn PDF document text
    • http://gaudi.tw/upload/file/4180876993.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/24998552306.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613033465c1bc---31123214900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hd+streamz+tv+apkPDF 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_off0000c394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA6 17392 bytes
SHA-256: e308ec680cb1da7c2c220170a721428f9f0b47a05e92958d8bed0c4cfe69a749
font_02_sfnt_off000108b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B9 10400 bytes
SHA-256: 040d4d3fcf2447de2c5fa7eed7c25ab471e0dc1eea5c8b0e11b8c5b0aaf45b42

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