Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3099c3d92bdfb18…

MALICIOUS

PDF

79.2 KB Created: 2021-07-01 10:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aeea6796172879fef63198e520005cc0 SHA-1: 45e4ce53f546a38613b777983cb846c7e699a72a SHA-256: a3099c3d92bdfb185db147b5fbe73f140d7b1f4f18aefb342d6cdeee1e82871c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which appear to be compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=pdf+to+word+document+converter+software+download PDF link annotation
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a3ee9a53bd8ab578f2f4a9c74e9f5dae/filepefogapaxutabisufa.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160723279224fe---32213033370.pdfIn PDF document text
    • http://vce34.ru/attachments/file/renajon.pdfIn PDF document text
    • https://unosms.us/userfiles/file/78632056967.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c705a0a67a9---radoxejekukeraxo.pdfIn PDF document text
    • https://digireg.cz/upload/13210909756.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/26701664c5191e049ff262296236efb1/jokukek.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/07050b2c596ae983b9d83092682a1506/20195166098.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827c2fb181a---20408921863.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/rodite.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/169de2b870beb1abda386679c9d3bc43/31106501953.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/o3g0n45ua7ul86epp62oamn7la/18353011894.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/70695314329.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16099aca4c0720---gegiwejemogovapota.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/mijipek.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/84144455636.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c791f9eeb0---kekidibusapidi.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/77912040878.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16099539093af6---89404001299.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/58708732856.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/mawuzisubuvuxesarusipup.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/bekiduw.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/73313436483.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/20257298400.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_off0000d0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EA 10800 bytes
SHA-256: 2a50593adb1dd8fe744b6aec083a143806fc2c90e0bb62ac163b4192189c8b30
font_01_sfnt_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 16820 bytes
SHA-256: bd4b29ffa6ab5672419eec726902fc90265ca9cfd0e6abd60a855c9085c0df2f
font_02_sfnt_off00011589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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