Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d49ab6c2dfe5b5…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 17:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cae78d00f7f716187761f7f86ba89323 SHA-1: 13cfe99c6495cdf8c6519cf37143eedb581231ae SHA-256: 37d49ab6c2dfe5b565b02f9a88e7ab6e7cf82cc5e2f2db7b4dcdde7d3b26618c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a browser extension or update. While no scripts were directly extracted, the presence of numerous URLs, some pointing to compromised CMS uploads and disposable hosting, suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://progfin.pl/userfiles/file/puzaduzubavopafulasomofoz.pdf In PDF document text
    • http://evo-models.com/uploads/userfiles/files/ziwurutudabez.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/begebuzijobajagabariwugaj.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/55761280950.pdfIn PDF document text
    • https://aedwea.com/upload/foto/75380811012.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/9949029484.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/66517509583.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/11088292839.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/guwanodituzifodijal.pdfIn PDF document text
    • https://sambelteri.com/contents/files/liviwarumidizu.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/90280417639.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/38301372648.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/mugolixorojarive.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/67823154508.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/28460788616.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134856dcae75---tojivibar.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/50825916636.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/86616468426.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ecf109a81d96c5b9a467a514d7f5b9db/37931894753.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/66867060939.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/liwoniredavixokewe.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134929dacd81---11719279699.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/51685528189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=my+phone+keeps+crashing+appsPDF 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_off0000d6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6ED 17808 bytes
SHA-256: 2b47b052805287fcf4c407724912cb5b1f6ec9b7f57bdcc03001e72b75754623
font_01_sfnt_off000104e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF7 10708 bytes
SHA-256: cfec06984238b3f433b24b4ab826a07291088a77d1dcf5f5b59aeb68d274b049

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