Malicious PDF — malware analysis report

Static analysis result for SHA-256 d201bd5018fc2598…

MALICIOUS

PDF

81.2 KB Created: 2021-09-14 02:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b7dced9ea4afd6d7e85002668c06ffac SHA-1: daf5b6a5f1e3eb814db16f7fed81e438367170dd SHA-256: d201bd5018fc2598c57b76cb2d2c46fcfe9d74710654190cddd9518a247041c8
196 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. It uses a remote-support lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 http://dralituncer.net/userfiles/file/lizupovevoleguwob.pdf In PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109092105475711.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338bb4d2495---refejazabebipasemem.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/08/file/56469951003.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/27035479656.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/41126503435.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/jobefaduko.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/lidisegamudido.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec0959fc14---14660237621.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/71771057496.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/38329661385.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/tinevugewi.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/xulubevamivibatogagef.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/48669007758.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/sigipadujez.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/42226041404.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jaxorijorovol.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/4056999778.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/58581783614.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/geviviwizanububepidotedid.pdfIn PDF document text
    • http://screen.by/images/file/76643015154.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/rss6gt18c8b0nruoht41pcg44g/15984726667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android+system+download+for+mobilePDF 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_off0000d8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DB 17468 bytes
SHA-256: 012870fb7c6b8ed49257bf900ebc07e4e5018ecb88d5588b29a5292dfe44e8bc
font_01_sfnt_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 10836 bytes
SHA-256: 2647dd8cdd9db12f44f7dc978001655ae7daeb1d714be9c6b69693ef2dc70fd6
font_02_sfnt_off00011efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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