Malicious PDF — malware analysis report

Static analysis result for SHA-256 153fe3a18ca61791…

MALICIOUS

PDF

92.2 KB Created: 2021-06-24 13:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 57fe2c779ac6cb68b55bf2c7891f8c62 SHA-1: 5d6efa8f5130865a0bf4672522ca7bf64986e8a0 SHA-256: 153fe3a18ca617917cfb6e5932ef31e7a166f6617135e73e61d5f9222bf05a8a
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 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608d75b5d6f28---teruk.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/ruduviti.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/29156f9dc283a368f35b6a216227b993/31982855865.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b17f6c05bd---66314334698.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/58dc198046ec4022bc4d7bd00b24c549/dosulopevevoped.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/46024554745.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/51609496753.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/zonitogazitiwos.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/b0soglfrh6kkuvsg8ahb1j9g53/68721444742.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/qicu6ghlfqctdf68mka4h06nbs/xufugetavetenuvezowusami.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/277559808.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/85147519822.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/5553351028.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/d20c164e58cfe66cbbbb8cd5c98719e9/lexibepexuxerabu.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/0710tu20mdc7vkk5asm0aai5h4/42565342142.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/h4bq98th4npafeak30dcenakiq/18689967115.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mahabharata+pdf+in+gujaratiPDF 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://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_off0000e779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE779 5312 bytes
SHA-256: b456c79355305a3af0918aafd1dc2a4df20c53e6fab5c4c522ea93854ffa5472
font_01_sfnt_off0000f990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF990 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_02_sfnt_off000104f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F0 8844 bytes
SHA-256: 6bf31bd438f2c6cc1e9efca857cea269c22528d8f8898c187c54819eac5356e8
font_03_sfnt_off00012110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12110 11132 bytes
SHA-256: f914e95a28b4058060059957781b52ce506904125475797dc9a39da823e40a13
font_04_sfnt_off00014762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14762 8868 bytes
SHA-256: a530e1173d90d11feabea89fe594b4a23a887cd2cd1d8604261341ff90699214

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