Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca580d8e80b0d29c…

MALICIOUS

PDF

77.1 KB Created: 2021-07-21 05:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f3df8cb8221e4d5ee4a011a13a9fd122 SHA-1: 51e70bcd544a85b797e1035f6a9b3dc93daa2197 SHA-256: ca580d8e80b0d29c0dd5510c23db5fafd8654f896f4c58b18964fa789be32461
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple links on potentially untrustworthy hosting, combined with the PDF's structure, strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://delvalle68.com/clients/54584/File/vuxuvinarosopiwogak.pdf In PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f74db79a1ee---71825941315.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609daf7919392---muxivororu.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/jijagozukud.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/45522108626.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d3d25feba---23079167110.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/severe.pdfIn PDF document text
    • http://limoride.net/gallery/file/56894131194.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9158cac2c87620bc863fb0bff78991b6/zezono.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/9d1ef2a82f70e6b06ad6cd025e140739/24516116836.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/xosajixokiwadunemowu.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/vetalok.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e2abb7d729ef50e80574639f6e5ed534/mevezozilazofotozuj.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/1745281396.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/balosukuga.pdfIn PDF document text
    • http://envigest.cz/upload/file/kamezala.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/21046623574.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/11892398238.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/57376980090.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/54711132259.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/65412197551.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/62008873932.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/5neeltp3itnnbesva38o7lkt1d/90445200303.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/wujedagelupaduzitixuguri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=hp+envy+4520+softwarePDF 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_off0000c6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B7 10924 bytes
SHA-256: f389e9500cf0593dc64ef1fdcb48596460d9a50a8a26bbb8e0aa4636e85848a8
font_01_sfnt_off0000e05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05B 17796 bytes
SHA-256: ba9054c64c6de36beff4ecf4c24b3976cc28fea6808ef3c351e168328d6cb5a5
font_02_sfnt_off00010df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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