Malicious PDF — malware analysis report

Static analysis result for SHA-256 05506d0f0f68ba2a…

MALICIOUS

PDF

74.1 KB Created: 2021-09-03 20:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 30de4d7872d12be7322f27b8408e9dc2 SHA-1: d750f286899afc32086a40b462be3b5916155d28 SHA-256: 05506d0f0f68ba2a5bfb8e0ee83cf1cbdbdb3e006470e22c728b6ef02e3f6b70
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document is designed to trick the user into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were explicitly extracted, the presence of numerous URLs, some hosted on compromised CMS platforms, indicates a phishing or redirection attempt. The document's structure and embedded links point towards an attempt to exploit user trust for financial gain or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://lutechmed.com/Images_upload/files/bijonav.pdf In PDF document text
    • http://zafirkort.com/uploads/files/woxitajunotedukigusafat.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/17029706231.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80629b903d---44005996319.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/soruzisixe.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/8f0e858eb789d4d1f3daa0c4a363b1c6/2995653261.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/46305801106.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/67362139307.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d26e0ed506---vanomenojijutitaje.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b60993c201---xefowaluremigezovuxek.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/21684866424.pdfIn PDF document text
    • http://blatt-gruen.ch/files/gifetetukov.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/97876280855.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/kepuk.pdfIn PDF document text
    • http://josquin-capella.de/download/70485101767.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/zajavowovita.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/85464137210.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bc138c4bbdfdccb610d59bebfc4f9af9/74205205971.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/50193234179.pdfIn PDF document text
    • http://imbirimbir.ru/files/tumunofugabal.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e375ea944---70262196995.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/f7528822fd5fb62fb65ec6bdf7881439/losuniw.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/goxifivivevisek.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/dilozinisibirekisatiragi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=infinite+divisions+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_off0000c0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DF 10200 bytes
SHA-256: c2736c206f85c845168ffd2e3fe678f27b9a3387d8b8760764ad0bb2ad8f30e0
font_02_sfnt_off0000efde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDE 16944 bytes
SHA-256: d5f8fa606a27c40493b0a1d686bad8302c71c20fade70601ad92821db530223d

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