Malicious PDF — malware analysis report

Static analysis result for SHA-256 b283bbd97d940a3c…

MALICIOUS

PDF

73.7 KB Created: 2021-09-23 09:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 816ba50a321215c816f439536fffa001 SHA-1: e59ede33f8ede69232301b8a87e04933b2edd5b6 SHA-256: b283bbd97d940a3c5b0ab4f7769e0bec6fb4cd29a8c5892e3a8546b447610d18
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The presence of a 'download button' lure and a high ML classifier score, along with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards an attempt to exploit users via malicious downloads.

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 http://1yunnan.com/ckfinder/userfiles/files/fesizenugirosejojuvowil.pdf In PDF document text
    • http://beautybybelief.com/admin/images/file/13685196922.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/88fb52eb91b5a8b87328088354c136a4/gekotekitifawotipize.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/jopilemowilopixuzowewasat.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/nixedutalov.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/28454866439.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/34261732655.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/29634207721.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/54767430147.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/jusokurosebunavidike.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/31049277980.pdfIn PDF document text
    • http://zuche0551.com/upload/file/56149007965.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/62478365870.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/wemojovixakavemifiwe.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/savunuwamigudigixoriremu.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130ec08dca53---36027109927.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f452d68586---79267863697.pdfIn PDF document text
    • https://agatanorek.com/files/file/gubasiturimepi.pdfIn PDF document text
    • https://gdaniec.com/upload/files/vopov.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/vubagapogopu.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/73160810468.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/navalegakababobawinidov.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/vivevetidibusirizu.pdfIn PDF document text
    • https://truyenskyt.com/upload/ckeditor/files/6721192732.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/58111100184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=download+game+bike+unchained+mod+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_off0000bcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB3 11012 bytes
SHA-256: 4c768d44e402c18c16c1aa4eede93fbac51beac1afdb098c656e4169f28a6c38
font_01_sfnt_off0000d5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 16540 bytes
SHA-256: da531e95ef02ccddb24764b525fe3b4e5f3309802b6c14594067e597d9cfef61

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