Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c5f0aebd3a3037…

MALICIOUS

PDF

75.7 KB Created: 2021-09-29 11:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5f60bf3fc105ab6b37b175bdf7daad4 SHA-1: 96ef28867e45e218bad44f6c42876db3eab6bf01 SHA-256: 35c5f0aebd3a30373681c6788e0ac526533338d4ee75b25e54f56de8ddd65ed7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://inwebjor.ru/uplcv?utm_term=best+gaming+phone+under+20000+tk+in+bd PDF link annotation
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbcda8cc2f---kokataj.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142dc2a0f9b3---70007066154.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/91504130329.pdfIn PDF document text
    • http://gardatrans.com/content/Files/xazudux.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/pusuvegajixibita.pdfIn PDF document text
    • http://preiss.at/upload_files/files/vidozenapazexil.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/44493761695.pdfIn PDF document text
    • https://scalper.ir/data/files/file/10578794676.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/83524617029.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/vegez.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/51012232122.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/66438343746.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614e031f588d1---tiviziwakozebur.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/boviwifobasuxurilefibom.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3607a5147---6366289290.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/bumegubolinozarik.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/37686728846.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/45338519473.pdfIn PDF document text
    • http://tochalco.com/uploads/files/76443544184.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613329613f924---takedafovemonigelal.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA7 16304 bytes
SHA-256: 8c0ce513c6e16b4af6a4e6ab0cf1bf65ba28d5342e5ac7df03bb3a6abd7a6cf2
font_01_sfnt_off0000d7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 11420 bytes
SHA-256: b46981f7a34b172e35cf2f184fcd51bcfbdd34187fb2dfbb9bcb6dd03f23e3cf
font_03_sfnt_off00010a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A56 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d