Malicious PDF — malware analysis report

Static analysis result for SHA-256 989ef07c267cac42…

MALICIOUS

PDF

76.3 KB Created: 2021-09-08 16:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a3b1307835b60a1b638926844c3a880c SHA-1: 24484d6acd3e34c0d4f91fb9eb84cce26a565c9c SHA-256: 989ef07c267cac42e28fb094fd8ac827051d672789a649fe85b339832bd9b48e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file 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 external URLs, some hosted on compromised CMS uploads. The embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://commune-bourre.com/userfiles/file/53203518013.pdf In PDF document text
    • http://klawiatury-foliowe.pl/_data/file/zegef.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/24806515458.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/1810764679.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/89406257833.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/finakabipuvuv.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/bowoneveguwejezifoges.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210905133342.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/wosexegilepaburewidoxiduf.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/251102bc04d06a6f5aac8bad4f58134c/xitunezotugobonuze.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/dbdb682f6b450cb57b798f3379b6d476.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///dugovifif.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/lepenid.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/efb0aa872871422fad6905e0632d9115/39351456237.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/974d455906281744e73963d5a56b474e/75239493419.pdfIn PDF document text
    • http://393citizen.com/upload/files/61859695381.pdfIn PDF document text
    • https://renteci.com/imagens/file/39895507058.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/zizox.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367577a7199---9116532725.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/91884352647.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/72116887357.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/gtac2shjmrikmomuf798af6l9t/jupugixef.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/643a506ms0g01naoi2kfjtcebs/lefiwalafis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tangent+%26+cotangent+graphs+worksheetPDF 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_off0000c54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54E 9712 bytes
SHA-256: 6f008992eeeb24ded4b8df096910d3d7412834e24374f70f7c133720f6932693
font_01_sfnt_off0000da90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA90 18716 bytes
SHA-256: fa196d56e953d9b4bbbe8cc221176d65b6a475468a2151ef23a23b9424ef300e
font_02_sfnt_off00010bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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