Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7eb77e7fc968384…

MALICIOUS

PDF

94.0 KB Created: 2021-06-24 06:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f9c9e5bdc0b915e6a078387b6041a4ff SHA-1: 852ef6870677f31b7bab81772a4e6e5d06006e18 SHA-256: c7eb77e7fc9683848418b2e5055fed4148eda1cfe0d3c9704825bb9253758ff0
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://weeb.nu/userfiles/file/nerolovasid.pdf In PDF document text
    • http://gleneaglehoa.org/images/file/rufofavatufajevu.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/4rfk6jgq1bn85m26hmc1n1uu1h/50217604497.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb37f777c5---22970824886.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16080bc3677dfc---zujolewapix.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/eecf9abbaa3fe56c011c93506f11c339/gazufivosaselavuf.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/zawimewumitojojareguwu.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/loehtlusssgn30leniejbl6f1k/71908218564.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1iib3dm9kk113fhgf9qdqi86s0/87639689836.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/65eda4396e12ca586a7a5812ab4075a6/15443333957.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5d5c8aeaf---58448510581.pdfIn PDF document text
    • http://short-story.ru/upload/file/98125364673.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/lexemuruworeli.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/71639697880.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9609eee93---jomoseretirolitomubib.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/19399996524.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/173b9ceb5bb613b20b0630f2f7a80abf/51376930618.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/23qec5c2ivj01gh5rvkjosemrh/37541936443.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dialer+lock+apkPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 2908 bytes
SHA-256: f744f8507893fcfdca003e21f3f27ff6b00dd9f69ea67fbd680e0829c38190aa
font_01_sfnt_off000100ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EF 4812 bytes
SHA-256: da8ecc9b4b43d78895c7b6b125644384f30dae6c6955d8511ae998e6db6f8d09
font_02_sfnt_off00011160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 4216 bytes
SHA-256: a9600052f877c1b84146be59376a8b6f5e4537331b576b34331cf48403b1f28b
font_03_sfnt_off00012156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12156 12088 bytes
SHA-256: 6ea02ef3272a1eb6db005ec0c74cce067cd2f3b622e29ccce936e2b8b9242980
font_04_sfnt_off000149a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149A6 16828 bytes
SHA-256: 2f1f5100e546d3ba9b823eb8c190b71f1764def50c215e5a5d87ed62ad0a53a2
font_05_sfnt_off00016090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16090 1736 bytes
SHA-256: 1648accd5638f26481c437d0e436fdfb03edab78dab75f4e73239278c8cddc19

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