Malicious PDF — malware analysis report

Static analysis result for SHA-256 158d09c8e33dfc96…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 14:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dc628dd9fb925f20662e931c5ea0fada SHA-1: cfe726cddcf1a140f5cd568f1ceafa83821217f8 SHA-256: 158d09c8e33dfc963e61482eca3339ddc54ff042111e77e91a33565b61d3debb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by multiple heuristics, including ML classification and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to link farms on disposable hosting or potentially compromised CMS uploads, suggests the PDF is designed to redirect users to malicious sites. The primary goal appears to be phishing or malware delivery through these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=super+mario+nintendo+64+rom PDF link annotation
    • http://matkinhantai.com/luutru/files/75961601990.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/99971251329.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/98276443255.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/didubikexopur.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/jetomipojekufib.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/faxevagibijaneri.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/nuduserirugivomuf.pdfIn PDF document text
    • https://computerzone.pk/file/putubudebusawixifinewi.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/pomufawakuzetusak.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613399a12033d---78398083983.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/butasuj.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135d01d66384---48573495158.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/63422414745.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210904180341.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/56778001393.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-04/images/files/53982228646.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/sixaponopubesorumexu.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/9507249737.pdfIn PDF document text
    • http://goldia.cz/data/file/bopijomamasotuxadula.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/xorigedakonuz.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/jipijifogedi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c97758a1f5a1438a2f46fb8f0851cb95/dazesagu.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210916001645_jur4m9.pdfIn PDF document text
    • https://domilot.com/uploader/files/tugotuxasugigura.pdfIn PDF document text
    • http://synhbio.com/upload/files/lajav.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/60231118067.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_off0000d93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14F 19172 bytes
SHA-256: b5108019b72b012fa6b60504c4517e11faa7ebdfdb5a1b39017350d85a311c29
font_02_sfnt_off000122f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F3 10760 bytes
SHA-256: 27b6101bfddfb5f1efb1d0df6a9049ffb94752a49434b96c47f4b81a9f9e3911

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