Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41cda888cfbd9ca…

MALICIOUS

PDF

81.3 KB Created: 2021-09-14 03:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e7ef1c440133a75beddc12b763da1da SHA-1: 5ca35d3982161ecf8bf27ea87908b875c13ea90b SHA-256: f41cda888cfbd9ca86abbeec8709be5df4f3f2bbaef6e8e95df0b03304385711
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, likely intended to redirect users to download malicious payloads. While no scripts were directly extracted, the presence of numerous embedded URLs suggests a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f55b0892b---notolu.pdf In PDF document text
    • http://fotosvatba.net/userfiles/file/99015552797.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/80412258909.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49805430379.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/4735163346.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/61977756628.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/tokusepogobolud.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/xupugosewasowuj.pdfIn PDF document text
    • http://arsvet.ru/img/upload/jawuwisujab.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/51983631598.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/losarir.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/42872315217.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/86421686175.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138b65fd6147---giwedakekalonelerelufara.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/vixoxibix.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/2504131651.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/eccc2e6dce4d5cca529ce9620b12dea4/46319822582.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091004092873499.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/nidepekojodezew.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/90105765373.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/tubetujuwuguzoxebopudu.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/99601273359.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/12061388427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=truecaller+premium+apk+2020+free+downloadPDF 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_off0000d42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3C 18764 bytes
SHA-256: 95ce30ab753da183f9ba6434b7a5a4acc7fce126f9ec36786e5c05869e301318
font_02_sfnt_off00011d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5D 11000 bytes
SHA-256: 070ac468ad6f4bcdc0193a9bb96c2ad4185c865780011b443b900f531305c2e8

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