Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bf5f31ddb9e8bc…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 11:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9890762c84534fa83442685639a02bf2 SHA-1: 1b200a01a86e5e24862d6a32311094139170b3af SHA-256: a5bf5f31ddb9e8bc04ba4c0a9512e85b8e49ccdef817b01738f3d448b329c436
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or content-redirect attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://queure.ru/uplcv?utm_term=lion%27s+mane+jellyfish+life+cycle PDF link annotation
    • http://tmkb.org.tr/ckfinder/userfiles/files/jumilinotudifojofo.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/60843871737.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/51456431789.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/69191a447c6e21a99e7ee6a6d8e7c1b7/goserituzox.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cfee2c5a7---17554335482.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613354811a3fb---94090117728.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b39860987e1c299079dc98577f6243a4/guvimurenu.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090521415461.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/39574225918.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e81d85da63c38032a3ef16d797c87c10/tivifojoni.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/73979510012.pdfIn PDF document text
    • https://netpage.info/userfiles/file/remevedexupogafefuwog.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/riluxuvusoxogadesaji.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/nunivamur.pdfIn PDF document text
    • http://onlinevay.com/upload/files/66935634197.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/55701349351.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/doregutilax.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/rowakow.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/lepovasarakaradi.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/jezafexizifez.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/60148470140.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee13d1d6a8---finunolikuwegidej.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_off0000d47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 17204 bytes
SHA-256: 789497a6da5dc69ef616986e79c1f01b8521ab3c4799f2ac18224ec106168b16
font_02_sfnt_off00011924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11924 10636 bytes
SHA-256: 49ccfb742314eb96ebea08132527273d6165dc8046468096bbcfea7fcb7ae729

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