Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ece11a84c10ab25…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 10:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e0ddbd3b297ad75f2df5d305066e76c6 SHA-1: 95c3a6074d21a5f293894687ecf3482b47d0df9c SHA-256: 7ece11a84c10ab25c47bdfc0dc955d8d0cc7def0162a19a0feca08dcfd446bdd
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crabandclaw.com/uploads/files/98196982676.pdf In PDF document text
    • http://speckrepej.com/upload/file/76495977948.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e914e068a4---rikalawuzoxusobigosuke.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/tuwovewo.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/kuwewuwutimagemu.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210905150600.pdfIn PDF document text
    • http://domosplast.hu/files/file/vawijidareki.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/21793880543.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210903090302.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/21274002271.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/retatugowes.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210906_5C1BCBE2A3B030BB.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/22d4d7eb74f905822edf404c329043d8/43507364431.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/fugebimo.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/44264449087.pdfIn PDF document text
    • http://retrofotr.cz/files/file/povigebu.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/71893995609.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d88ed24ac---zorozuzebuluzolavi.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/fipadovabop.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/7666040021.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/sufikur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2eb2e8ff7---silavivuxakez.pdfIn PDF document text
    • https://costarica4d.com/contents/files/93902330345.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/pabekedabukinizibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=grand+theft+auto+iso+file+for+ppssppPDF 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_off0000d8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C4 10732 bytes
SHA-256: b7bae58d7bdc70e4d67c750f70e919bef7ac2c277d6af6c28dbb1e357a9bfe5a
font_01_sfnt_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 17544 bytes
SHA-256: 709353183cb1b6d2602c0c4ca899d50cc2e4b77eacfebc6698d4f684a08ff480
font_02_sfnt_off00011f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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