Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb720edd3f19dd4e…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 16:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5425af0658750595b8bb3622ce909672 SHA-1: 30da008bbb6f682a030a47f3797b9064fc5438ef SHA-256: bb720edd3f19dd4e2544189c504cda253a85a7cd2d220fc3e9000f08ffeda7e7
104 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' heuristic further supports a deceptive user interaction workflow. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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://crewmak.ru/uplcv?utm_term=pokemon+omega+ruby+rom+gba PDF link annotation
    • http://iwilldoit.ru/uploads/files/files/gugoxabolitalev.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/famepasafegene.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/54990191414.pdfIn PDF document text
    • http://yepuco.com/uploads/files/powobaxavoki.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/77274517445.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/2250755270.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/57032181311.pdfIn PDF document text
    • http://synergyproperty.com/images/files/kuwolutajevoxirugosap.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/66889582495.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/73339683300.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/67411614289.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/c11f82dea7ff5ccdb19f3f87f1fe6b51/23538648285.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161442bf3b58fb---78059562092.pdfIn PDF document text
    • http://decorstore.eu/upload/file/1138321816.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/labisunatakaxexupatuximez.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/24605906841.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465e00d33b5---50063007897.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109101805553327.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/83686525226.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/68979454883.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/tesolani.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353e105aefc---tiburimov.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/f179f560f572c6b904d4c05e345ced29/75398039317.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/bonunugidapo.pdfIn PDF document text
    • https://5udua.com/contents/files/borogibixin.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/89419251866.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_off0000d59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59C 18196 bytes
SHA-256: 37e2e29bf099141ae9313f68b58db02f0472dd45ac00a78625d529ae1469c2c1
font_01_sfnt_off000104d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D9 10496 bytes
SHA-256: 759c548e1d8076fe654863dffacfa7e6dd280c2033abd0d7dc9938cc2131f7eb
font_02_sfnt_off00011cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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