Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4701fb25bc0bbe7…

MALICIOUS

PDF

96.0 KB Created: 2021-07-03 03:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 127795a57a1ca5aedfd5c1489bde406e SHA-1: f42e5411c1107fe60da7b09c48964fb363f01d07 SHA-256: e4701fb25bc0bbe7d8d08dc823f398c2efad7624a9ba80e51b8d2355549bad04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress installations, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL findings are sufficient to classify this as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://catamma.ru/uplcv?utm_term=poems+for+primary+students PDF link annotation
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8c91866f4---kulafirigonesexobe.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075e3171bed2---91741065068.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/i021e4u91tqj6s0t8tqnh4nll1/73685317030.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a13b0c616---59739724241.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/7ac9f84e8872220d1dea57fa06b16c7b/sizetemazogezosojali.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/kebodelikuwejosaziwubu.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/37583625758.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607555d2dec19---filawiti.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052008495975.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/72315250758.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/95826132615.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/11042046901.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a017b8f3fc---51738232813.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/201a89539a18f5e5925a02b57dc13000/fujoruxowewa.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/471983507f4c71fa65180220d059f96d/mejoketenazozax.pdfIn PDF document text
    • http://babamoleskine.com/files/file/70650674530.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609450559b1c2---82993009460.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/1c1b62e4c0a5e50176abffdbd8e4f232/luribaxagixitetise.pdfIn PDF document text
    • https://activepymes.com/pub/file/lujatefufazitekelavaki.pdfIn PDF document text
    • https://mszukam.pl/dat//file/daneved.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/73077135495.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/dilopepas.pdfIn PDF document text
    • http://pronobile.de/catalog/file/31171293422.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/lm34f4lcuqvisacdj6m6bcasj2/bakekasina.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/xuxaxo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11476 10828 bytes
SHA-256: 1cd5172c8e8a8e94561cb26dbe1d6cead6943eb2d57d9b2da81fdc0ff2f7b2b9
font_01_sfnt_off00012d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14593 16952 bytes
SHA-256: 7ca0c70742e5019a3d52e41d48d00e9eafe86d22dff1d129ba40bc0d50d5c4da

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