Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e10aa77738aa0d0…

MALICIOUS

PDF

75.1 KB Created: 2021-09-05 02:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7105daab8e0a5481b9d2c0864bc72da6 SHA-1: 70e86dcfd037cea22cb92e47577e12908634f745 SHA-256: 2e10aa77738aa0d098a06cafd24283853adbde5c658c8e31085a9655f8158497
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple compromised CMS upload locations and disposable hosting. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/f124jlr2rbba1t323s9n3fvlh6/kivewezelisepuwi.pdf In PDF document text
    • http://n-production.com/upload/fckeditor/file/62488780120.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/30019289028.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de1a15c32f---zobutogolufatuj.pdfIn PDF document text
    • http://dytac.hk/userfiles/fugumelepuz.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160736be5e9d28---3594688130.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/16230089783.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9bc1564b6---fapezawegelesuv.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/nusimosupagibibijali.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/8fn2g7e11gk9pegi845i0972nc/37294720198.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/xujubidenesizodub.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/zifakutonogojuxabolivusuw.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/fa6bcc61165adbb4cf23f78186ec5f2e/43728876019.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37d0b20a2---faxalewumusaguladupuged.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5d82e54ef338394fac1ddc69abbce4c3/62627529688.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/zudogewoka.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9516f18be0---87214446893.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a592efc96---45818222212.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082cf835a7bf---kuvulaxatinelokek.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/55455859225.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/dugodi.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b43518cc8f1---dotidubamajegiwolij.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/19043129165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=a+collection+of+data+science+take-home+challenges+pdf+freePDF 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_off0000c5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B1 15236 bytes
SHA-256: 42418be1c59b0877bb7b9c61459a229f9cc69fc0b4facfdeadf879ae57aa7ade
font_01_sfnt_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 11172 bytes
SHA-256: 26f267503d0d159ad498ed156b21ea5e7319d2968be8b0b425df3441bdf74110
font_02_sfnt_off000105fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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