Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee41625e67dd6f3…

MALICIOUS

PDF

75.4 KB Created: 2021-09-06 07:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 067cfe61d45a0ce9868cefa35fd9b149 SHA-1: 4980ee02ae2692fb8a5ade7095bb4cb4953996c9 SHA-256: 1ee41625e67dd6f39f3649e6d30f809dd7578f693fb00c40cab2971c06357c64
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The embedded JavaScript likely facilitates the redirection to these malicious sites or potentially downloads a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=pulse+code+modulation+matlab+pdf PDF link annotation
    • http://concept-art.nl/app/webroot/files/userfiles/files/sirekuwazamipu.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/67042672808.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/xuribiwatixepu.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c8934f806e719d31ba9e41dbaaa928a0/64030276291.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/93314272329.pdfIn PDF document text
    • http://yoron.net/up/files/69723141188.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vekunaxaravesiburogij.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/josexami.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6c0da7eb---lurumujuxepin.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/tinikijif.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc4559158fb---tewum.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/19101385144.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/dabetaduxadir.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae43cea73f2---vifepoka.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611d750555232---ziremebogusovojugof.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/vulatepe.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/72909055953.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/gikatajanajawasugek.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/xirezilolivafobamurazenis.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace9fc88ee6---67803270125.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/tevafubogebuze.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/29243733044.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/tapavezorikamusolokut.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/sudinole.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/gezelarederopori.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a3445f977---dosituxuderemememot.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/b5601fd0e018f99af5bde9f32da519f3/towupanubugimiwipugajex.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_off0000c462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC462 10924 bytes
SHA-256: 346cac63a0b7e2d6395a4b4a0f71313b1baa2bc5098a59ef3bb780fbfea8741b
font_01_sfnt_off0000dd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 16428 bytes
SHA-256: 0e8cd752371669a635c2ccfae5c14e8fc3459804d62e26757488112921cd5af8

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