Malicious PDF — malware analysis report

Static analysis result for SHA-256 c443e6ac7ef2aa65…

MALICIOUS

PDF

75.2 KB Created: 2021-08-15 02:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5eb600a58eb385f72e810ced3be3462d SHA-1: d24ad784aaa186391992a476cb69d88c8242f007 SHA-256: c443e6ac7ef2aa651ec0b46ab205ae5c80fd35778c4bb6a5927f5598824dbc39
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://philabc.ru/uplcv?utm_term=la+bella+ceci+y+el+imprudente+cap+30 PDF link annotation
    • https://landbondcorten.com/attachment/file/5c0d08093691b678233db4ab2c1bb905.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/8883510768.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606e744c4fc8e---42233038381.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/paxedorutawuf.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/zazevogabadad.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/gezeziruvutul.pdfIn PDF document text
    • http://aquatherm-graz.at/files/xaxozewozo.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaddc42c5f---zogirabuwezugiveguzid.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/pibuvolibureronamuno.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/39501079707.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e4efce69a---65433816400.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b6b4f2b22---xomonitulilajumexelotu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b3cfc0bf1---lusevexubume.pdfIn PDF document text
    • https://vestol.bg/files/file/zakedowikijo.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/57204817045.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///46256856104.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/84053007454.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/zerivazazuruvivuvagiv.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/mijedamisujuvi.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e221bff53---lupis.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97f5e1d31f---60084684146.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5eca426142---bepuridujike.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d626c36379---vuwun.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/245041ed181b8266b5533935af49b723/jibarexixaxelu.pdfIn PDF document text
    • 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_off0000c275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC275 10992 bytes
SHA-256: a03963fbca7ee55764724a11bbba84678830d46bcf4c682903d6575e723a136c
font_01_sfnt_off0000dbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBE 16628 bytes
SHA-256: 052a280693d110362fb6d65f930aaea640e3b2e88353067b8052e3183499dcfc
font_02_sfnt_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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