Malicious PDF — malware analysis report

Static analysis result for SHA-256 198d1f64da85e851…

MALICIOUS

PDF

82.8 KB Created: 2021-09-22 09:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aa9430fb6add41be4535d833da9bf0b7 SHA-1: e7d4d653a70b6b20dc900e1ab65b0d20e3aa4c92 SHA-256: 198d1f64da85e8517d81d24a0e21855f05de8a74bba1dec2f7e552dd6d172633
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous unknown URLs hosted on compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of numerous external links indicates a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f7f5b011a---81876652050.pdf In PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/26931292389.pdfIn PDF document text
    • http://prograsifkalip.com/files/dugimetamenije.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614007b8dd0fb---nedot.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/45527069825.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021091922582787.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1631521401.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/79602300714.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/vevixugosike.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/fsh1rtceubtm340448u6pq7t87/samubugesutoboduzisal.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/78417243647.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/2521324461.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/73998898431.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/xasosa.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/84475166272.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/zirefuwovafi.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/10140693542.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e6bb3a7ac---suvezejezujugidilopo.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/jisufizumuxad.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/gidawuramikajeketovubo.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/nanirorazetuso.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161354c729927a---6784315947.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/92713047022.pdfIn PDF document text
    • http://teknis.it/userfiles/files/72819986738.pdfIn PDF document text
    • https://masukpt2.com/contents/files/nipuxudumoluvutekujaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=last+stop+on+market+street+pdfPDF 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_off0000dd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD83 10568 bytes
SHA-256: 5f2d18efa1697102644392d7bc6946d9588d79a32a3dba14dd6839c4c345dbb0
font_01_sfnt_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB6 18764 bytes
SHA-256: 0d4c3a0caadf3b053e7e5536661c9ec63bcf545155bb32503b3e686b5f3fdcce