Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a1bba1eaa498e0…

MALICIOUS

PDF

82.0 KB Created: 2021-09-24 07:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 624ee6f4fe44eaf145fa7783efc6fa3c SHA-1: f1bb37756342adf178f982630a691d5c2a930937 SHA-256: 93a1bba1eaa498e027ebce443c32a7e5eed324ec4683395727728aaf9ba5b3c0
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised WordPress sites. The 'SE_CLICKFIX' heuristic indicates social engineering designed to prompt the user to execute a command, likely to download and run a second-stage payload. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://drafthe.ru/uplcv?utm_term=how+to+increase+upload+speed+mobile+data PDF link annotation
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130963d05773---dizasurudirapulidedo.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/nomoxijefekezidara.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/49186896816.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/depuzato.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613827d26fbb3---90314620879.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/gofakorupijibumebasuzu.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/piduvogusatibipemeguv.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137ded307f30---voteguvodogowijubekamu.pdfIn PDF document text
    • http://myphamasia.net/upload/files/dujototepikirotosima.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/84995157992.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/722s7h1i20a5uusee0ffjunobv/sogenijatorew.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/3591265971.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/debivenifalemojuferirux.pdfIn PDF document text
    • https://yodobashi-church.com/zaradazazisi.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/96316746948.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/2cbbc8f6f4a8786b79bfac520ee486bf/41681712953.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/45655429935.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/37517378723.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/danile.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/litavad.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/sulodukenotariserepu.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/fisusixobegawe.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/10613319432.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/42482553156.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_off0000dbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 10992 bytes
SHA-256: 6d576a0f947eff88e0c8d06cd1b1c848b93baf55d847e238e91066ce2966a22b
font_01_sfnt_off0000f531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 17748 bytes
SHA-256: 04ee5092e8d5c81d0ef6eadef96b4b8631e83e990f4b635608858882717e59bc

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