Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9a15d291ffd55c…

MALICIOUS

PDF

71.3 KB Created: 2021-09-26 07:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 648724a9c70038726c34a0b591cec2ee SHA-1: cf7c2bff0e2147f5e7730a2b5d65a195774b671b SHA-256: 0a9a15d291ffd55cd7a7d021af66e42e0224df491a627b04212d7236fdd13d0f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs and the PDF structure suggest an attempt to disguise malicious links within seemingly legitimate content, likely to trick users into downloading further malware or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://affordableadobe.com/ckfinder/userfiles/files/4849860310.pdf In PDF document text
    • http://quaint-house.com/images/blog/file/69828367956.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614f738818b8a---xewipevelipitukajigilobi.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/29658742453.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/77285150644.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/50537441584.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/36813609420.pdfIn PDF document text
    • http://fedime.org/imagenes/25374329749.pdfIn PDF document text
    • https://matratva.in/userfiles/file/lufigezuwiruru.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/fepuveseruvekup.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/16076473109.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/21090182734.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5edfb1247---zajaxax.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/45483496899.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210912090910.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/fomoduwibenux.pdfIn PDF document text
    • http://websitesample.in/atlantis/assets/ckfinder/userfiles/files/96640022685.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/53805613389.pdfIn PDF document text
    • http://tenis-klubmoj.si/uporabnik/file/72751967537.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/67632282112.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/31236547654.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e099a74c00---piriramelaxatoridi.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d4ce8c585---wajeralad.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/tusojudek.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/90674203129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=miroclash+apk+download+latest+versionPDF 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_off0000b321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB321 16684 bytes
SHA-256: 2278690e112223213d6a7141650c3a8dc52717e721bfba651e84c898d2d72ee6
font_01_sfnt_off0000dde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FA 10848 bytes
SHA-256: a1f851e0e74f46fc9d6d7c35480de2227c942812042ea002d2f5bd4a3388f7d5

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