Malicious PDF — malware analysis report

Static analysis result for SHA-256 0959cb1cba871bfc…

MALICIOUS

PDF

85.4 KB Created: 2021-07-06 19:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 548c0d47615f39b9b6e9592ead23a8f4 SHA-1: f574ceea7c8c2ac83c2d4104a6d1c9c4234d33e1 SHA-256: 0959cb1cba871bfcf93bd1ef59bee3623607f6e9ce1512ff2dd87b7039040c58
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. It functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or downloads. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://zpb-maciejewski.pl/upload/fck/file/nudejuvu.pdf In PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b916f59a422---jenivetomafe.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/14410853011.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///53088506153.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/0628a6cb792ac5ba96c6f8da63ea72f3/nojupitavubatemofanixo.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/jilogelunetizopumaviwanu.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/xujugut.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/mazev.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/xogowivomudorokisiw.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/nf471ejrqvak39oeghc5cffbej/3790130756.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/elsfaj3egmhvkqoenijrubqnbb/kulamuxijasetemesafimidek.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4dec96e4d---migasejezedumetaga.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/28349084073.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b57516b4eaf---webitiwuvowoxizorovu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075d5e559389---tiwifazivuxasafonogadi.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/sepepig.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/hdeusp869tca5eu8h6r6une6d6/fevetal.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5f282c388---kadeguduwamupugevuzek.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/klefvicop7k579jh43qbvjjbk3/37317818854.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/jativa.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/fe1c89318ad03c78d4aa740c152c1b07/52484536555.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/4605226865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+self+in+philosophyPDF 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_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 10460 bytes
SHA-256: d69513c59036f8ffa5c9546f7adcc44148439a8fd9bbad5b93b9107b535ca25b
font_01_sfnt_off00010367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10367 17640 bytes
SHA-256: 3f5f3bd60cced6e8a8284787bd1bf571ba1a39ef2684573c3268640b6f92c6a1
font_02_sfnt_off0001308f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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