Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5cc77e4ffc8c9b…

MALICIOUS

PDF

90.2 KB Created: 2021-07-28 12:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 3b645a1ee6e2f874c43e89804e0b7ddb SHA-1: d200cd16b9ebf5f6b3322ad00166a4a07c4aa7e7 SHA-256: ec5cc77e4ffc8c9b94164c98f77f305e026836fea88e6966f34ebe34eb9e95a2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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://tyros-club.de/userfiles/file/butuzega.pdf In PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb0f895c87---xuwuri.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/7886466681.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/39403468641.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/totujer.pdfIn PDF document text
    • http://www.puhito.hu/uploads/negadoxope.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/67438997982.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/0022875b91c39449085c6f4c3af5c38f/zasevuvupovigog.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/13081346613.pdfIn PDF document text
    • http://lobi.md/userfiles/file/zopipekovetutason.pdfIn PDF document text
    • https://blogsma.com/files/nevotot.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608394c052a27---solopumivosin.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/394115870ea226bd6e1f72cdd2d57c0d/17102821913.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/64934711451.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/pesidanamafizo.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/vemog.pdfIn PDF document text
    • http://doer-sh.com/Uploadfiles/files/fubore.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/96782168490.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609863cc9a601---7202373585.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/63780411599.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b73267e441b---37069158602.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/bc8c1e8d821cdf908a9f6b34131157f4/77927631976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+make+farm+in+mafia+cityPDF 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_off0000eafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 10568 bytes
SHA-256: 7e4b42cef324346c2f26eff7423bd365e350e804cde98d7750d889ecb2a4e031
font_01_sfnt_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 2500 bytes
SHA-256: 0617fa07f9c0ecd5a68fde772993e7ab03ace1c3895d68f0d17b0671eea6a7dc
font_02_sfnt_off00010db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000125c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C4 20512 bytes
SHA-256: 466cd4af5b8e7e1fcab9fb789250729a043f9605fd0516845813ff9da9aaf069

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