Malicious PDF — malware analysis report

Static analysis result for SHA-256 78491dec4d09026f…

MALICIOUS

PDF

84.7 KB Created: 2021-09-06 21:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53c126b8bcf068dc88e4a1fdd922f346 SHA-1: ccc6f7178a5d29f8e7bfff3230658fde796268e2 SHA-256: 78491dec4d09026f41be50c8910f95a6abf46b9fb6c14189413d81ba7b092993
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload directories. While no scripts were extracted, the structure and URL patterns suggest the PDF is designed to lure users to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6a19961f1---lukumizasagexo.pdf In PDF document text
    • http://tcihk.com/userfiles/17298847910.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/92515245689.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/93604325420.pdfIn PDF document text
    • http://imbirimbir.ru/files/10026339597.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/kikusogukijufe.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a87839d2c71---fepunipakanudefusofe.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c117410695c478303a87d62f3eca6845/52267978784.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/okjrq9dlbsu19tnk0hujg1gip7/juxejek.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/bemoxajofax.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/b72c1b9a86dcbd21fde208b1ea0da8f5/vidunugipem.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/c381mahk6qg802v0030jj3s7v5/fanixotetusakitaginiwe.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/pakupivawu.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/74559986033.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/d3207954c746e59cb6ea90ebb8514e67/kidodilet.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/s4tq2im5gja746b8604t98urog/18013573509.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/30925078917.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/91335832847.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/34558277101.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/1745865675.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/755eq4dvkrsqobjcp0k0im5qkr/xoxeledom.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/rirerodenukitoxugabo.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/gewekelonatetivoxepabe.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dfe5c88317---wasurimox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=critique+paper+format+example+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_off0000e616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 10764 bytes
SHA-256: dfad2660a57635e4fa0f1192954566a25b7ef14a7606f7e6b5360c487c50f003
font_02_sfnt_off000116c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C2 17996 bytes
SHA-256: d523c4cb15840844ded19ed22b5e3aa1f708092330f745fff71c251a4f8ddb1d

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