Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb76f0c040480f0…

MALICIOUS

PDF

73.3 KB Created: 2021-09-10 10:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 840f39e10d5715ed792a83487b1c5ba9 SHA-1: 4e9d2ccf4564d543935fff6e736800036ccd0ec7 SHA-256: 9fb76f0c040480f07897f54870609c25ce7039752fe0084efb3c3bfbbe2fcc72
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute further malicious content. The PDF itself is likely a lure to entice users to click these links and download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161305b840293b---1785932661.pdf In PDF document text
    • http://indianspringhomes.net/userfiles/files/10804390643.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/sipira.pdfIn PDF document text
    • https://businesslife.com/content/file/28133193654.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42859980179.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/midakinoxigojo.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/94724605060.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/qmblgbbjodmkjpaitn9u0annh0/biziwifelizesovediwir.pdfIn PDF document text
    • https://clickbox.ro/images/file/xigovewezideribuves.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/xelenoduba.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/gefejorifosenobowul.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/69803805194.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/9259548705.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/takutemaxuzasinerekaxilux.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/folatijesokim.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/xubesuveledonuzeruloga.pdfIn PDF document text
    • http://packturf.fr/files/tebevep.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/naxomu.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/96225902448.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613065b31bb19---vuligenobafubonubom.pdfIn PDF document text
    • http://metabolit.ru/files/file/gakoge.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210904_DFB7FF3B6F7EB188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+make+text+faces+on+androidPDF 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_off0000b44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44C 19520 bytes
SHA-256: bd4d97b687c129574807a5255e3beee6e9ac5e755f2c40f3343abe7e45204c09
font_01_sfnt_off0000e67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 10864 bytes
SHA-256: 4c92da10bef10c666db1af5438eb34ea0e117981b67f87392a9793ae36652164
font_02_sfnt_off0000ff9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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