Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c69c34f66cfa9f…

MALICIOUS

PDF

85.9 KB Created: 2021-09-05 13:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 89abb09c782a460fbfd72207d5966a1a SHA-1: 237c9210fd8ea3aad0e31cb9964cc72e44079814 SHA-256: a3c69c34f66cfa9f5230fa90977765e3a3b88cb57668507c3f748547b4e46b91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the heuristic firings are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c951a9386c---lexomafa.pdf In PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/46797901014.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f2c5ed5d7---reromuj.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/roturojoli.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b81364ae801---41483735711.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/21064741753.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/wekekiparugij.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/97c8a3ffc39ed5bc4c9e42ba2345a4d4/luwasuzusuruleti.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f59d692048a---temikixetujebesonevasi.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/58741828181.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/ea4d47f84bcd6072e4ad3c7f0ecdad10/gewurusatukuf.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/madilagikoluzotefidod.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fd668bd81c6---21788184713.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/subix.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/2f48502e2a1c8cad6e3d4d2546ac70ba/82425298212.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/42263817880.pdfIn PDF document text
    • http://ceroki.com/image/files/fanidebarezivi.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/88925742638.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d03d990a15---99101187051.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de3a9a32194---21286616764.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/wawamatabamejareneduzu.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a8c59c5b7---24025810236.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/78922104728.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/94csc7oniolv4imckkgusqclh0/56477068759.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/79666563980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+make+magnetized+water+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 10856 bytes
SHA-256: eb38208e1d259521781b01f513476a998711be82a746b6a9eb222bed3e05433a
font_01_sfnt_off0001045b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045B 17484 bytes
SHA-256: 3cf5fb33d89f46cadb3627504a14cb12bf0912426dd117a9fd279e9e4f6d1a4f
font_02_sfnt_off000131ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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