Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d38fe9e2b18cc97…

MALICIOUS

PDF

131.3 KB Created: 2021-06-20 13:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: cd041ad4faa15c659af0e5c6b7dfab9c SHA-1: 7e9bf42c1449464f03f39a036a88253558acde98 SHA-256: 3d38fe9e2b18cc97ac2b211f8568d22bb4a6f9ff84fe76cb84b97975522908fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://wastran.ru/uplcv?utm_term=ganesh+puja+vidhi+in+bengali+pdf PDF link annotation
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/1300ad629629b0dcca2c81733c3626d0/43642418369.pdfIn PDF document text
    • https://www.epicbrands.co/wp-content/plugins/super-forms/uploads/php/files/c8f21ede6106ead584e8a9515f149c41/jiriwa.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c779c83a277---6463160006.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/1372427123.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/miditefifodo.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/pososamiwuxedojiporunaja.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/v3dibup9aa9777jmht0lmo412b/27723164980.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/70822c263fced37cc63dbd07d241275f/lutujukuromebisumelo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2fe9e4239---61954460187.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/43074629784.pdfIn PDF document text
    • http://geose.ru/userfiles/file/duzenuj.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1979c7406---xilakidojolinulifedan.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/76861105629.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/lo2cb5krb55tr6ko5jfrdmi8ck/77917356184.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/fbb3a09babfd88d550cac3278a7fb13a/74350816406.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001584f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1584F 5208 bytes
SHA-256: e8e29aeddd94deca2cb8be26ab3c55caf32903d1b484b4f09fdee9ba3946d410
font_01_sfnt_off00016a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A05 21144 bytes
SHA-256: c2296d0c0d7019961723a0504fc024b2c8fbec6066c652312f0b1003170f6319
font_02_sfnt_off0001a43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A43F 12676 bytes
SHA-256: 8314320b3712b082f6d6d87729f9c109fc1ecf1081847577810dfa326d6f8fca
font_03_sfnt_off0001cc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC60 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
font_04_sfnt_off0001da61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA61 11048 bytes
SHA-256: 971f757330e2ea928015570ebe707eeb10c8f202ae663a584c814184d7eaf1b2

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