Malicious PDF — malware analysis report

Static analysis result for SHA-256 66dfdf5895931cb9…

MALICIOUS

PDF

91.5 KB Created: 2021-07-30 00:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec9e61e9c991562c2607efd09c6461fd SHA-1: 210903b9fb07168608c1fddd41019ebd61f3059d SHA-256: 66dfdf5895931cb9d2d81042c0b506486e2417a4e478a0b685106a5f8f9560eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the PDF structure suggest it is designed to lure users to external malicious content, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/gd2gbbds0pqsf16meh87m0jbt6/fimopewabonudakutiwi.pdf In PDF document text
    • https://air-separation-supplier.com/d/files/4191332450.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/68011468460d3e55b3986d.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/zitaforugojegu.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050707381368.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/nj4eon2kpss5kan9fqfkn4isnk/gejomum.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1739d957c---48419170575.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/69743824938.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/sitag.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/vusuxuwutefij.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/53675357428.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/rh3ihecf3drmnlu7fnmcciaoh6/99002935269.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210730_0DBF3CA1CE0ED2A4.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16094d7fd816c2---27303262689.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ee598ecd4---19062563153.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/20510883085.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/36973065994.pdfIn PDF document text
    • http://teplospectr.ru/images/files/pofokupajokijesagopumi.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3d233f4ad---19998328314.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/8482f055bf270c43bcf65792445aa107/59014924188.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd286a5f19---9932650114.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/dbe30f49d26a31d22363cde7d433bf89/80803076536.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f389368a7---rasola.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/50638124487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=seis+sombreros+para+pensar+ejemplos+practicos+pdfPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 18024 bytes
SHA-256: 5eb70d1908085d4160c810d69a8e6b5159b9f07c0215358185b3061c39971f67
font_01_sfnt_off0001188d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188D 16068 bytes
SHA-256: 6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d
font_02_sfnt_off00012dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000145c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C4 11124 bytes
SHA-256: 5581a28d9385fbfe9363f8d0cde7463de7b068a362b2beaf5a6874c8220737c3

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