Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f8207957ce7caf…

MALICIOUS

PDF

79.1 KB Created: 2021-06-27 12:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6fa8d2cfed842f676290bb26d4ef11bf SHA-1: 0cf834d090ccd08f6abc48c52d809acc7fa0aeae SHA-256: d1f8207957ce7caf7dd5b24c661bc4fe13997e540b1d53b438ae36a2dde400f7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to external websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dianthusindustrial.com/resimler/files/lanux.pdf In PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/1o9h0hm3ijm6irq50soj3in9r8/66449621527.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60a4196758---xotiwinukobonasijibojava.pdfIn PDF document text
    • http://aquatherm-graz.at/files/bibiku.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/8e56a628a776452696f1604a6eb7a2c7/89819593241.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/b7g8e2jq36oeu6lauvg3n7751u/3166911955.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160780dc34e4bb---57378842236.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160854151d4011---selebu.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/dupal.pdfIn PDF document text
    • http://erictex.com/ufiles/files/nolora.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/45df834c59747f798c9f5f2b1a3eec63/80264266850.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/84497637705.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/e81gejnpsijt087o7mj4uibpo2/82729478221.pdfIn PDF document text
    • https://btegypt.comfile/54473330983.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/vagazugajotupebuvamori.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/rker2e8v1mbv48qerglk50o355/89477920151.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ra20pi87hi89b5o1staj9rh961/wufilagazubimipuraveve.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608768cb1f2e2---pizalozofanelimokeji.pdfIn PDF document text
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/21436799856.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/muzuzabixadabijez.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812bf08ca97---23844176972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cost+of+electrolysis+hydrogenPDF 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_off0000d346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD346 10736 bytes
SHA-256: 3e84d5f8a470e444745ce13a48352220c84fe2510d66bc44e9d57c33c5c0f30e
font_01_sfnt_off0000ebb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 16832 bytes
SHA-256: ea7ca1d85879ac2a73213e8c8868e85c17df96a94d3761786f15beacf47f11a3
font_02_sfnt_off00011782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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