Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5d0c22c0ee87a9…

MALICIOUS

PDF

75.9 KB Created: 2021-09-03 20:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d689f1fc472415ec3bd4054f9e9b75ac SHA-1: abe5ed298b53c4bab5bc89cd9f3debc295c46ab5 SHA-256: 9b5d0c22c0ee87a9d6b9762bb673d4a18c1b2868de493921e71f48fe40c77ad2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=emotional+intelligence+psychology+pdf PDF link annotation
    • http://slhs1958.com/clients/18590/File/xiwemobixopuxezifilobavin.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/miligonasiwovex.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/31961598484.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/r430fd69klngcu6keui1cc4mp6/28471317885.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/fokiwefuzozinarerewibos.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/33288804365.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/dc6749f27f0aac23b7107be20de1c5ce/jomoseredobunawebivijujo.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/10596402173.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/16637316887.pdfIn PDF document text
    • http://recrute.fr/files/files/23077188529.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/301466f13a6cb5aec1104572729aa3dd/51534936887.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/76850246466.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/50014650744.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e909e9f199---81507945917.pdfIn PDF document text
    • http://7linc.com/uploadfiles/fckeditor/20210725/file/16272144722652.pdfIn PDF document text
    • http://ogbchurch.com/clients/880797/File/rurulajawumijelutirisud.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/47934846107.pdfIn PDF document text
    • http://benly-carson.com/product/files/63661423423.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/gosutixi.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/14816589607.pdfIn PDF document text
    • https://abeess.com/userfiles/file/femabefomalamab.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/lusetuwelevunelimisiku.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/9160755789.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_off0000c347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5E 11064 bytes
SHA-256: 5e67e62a1a0d4827cb6918851b1302f46d14f237b034d4c9b008c4b7b8e88713
font_02_sfnt_off0000f4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 17372 bytes
SHA-256: bd31074083303fd9d01f90143c1511aae6c0f596ae90ccf33b386950fc08b7ed

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