Malicious PDF — malware analysis report

Static analysis result for SHA-256 efff9b1945258a79…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 16:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 34593ac5b51d85da6355add1a36db6c7 SHA-1: 266c2406e42df3d247600aa2fbad586ba3a236fd SHA-256: efff9b1945258a7990af89822801203de7ce882ecd325583c543623adb0059bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The authoring application 'wkhtmltopdf' is also noted, which can be used to generate PDFs from web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=how+to+send+a+file+from+phone+to+computer PDF link annotation
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16134e023a8219---84459637533.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/69562288908.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210913/files/20210913100205.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/dezanoravejazuzetub.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/51690985912.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/xosanamed.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/50510339788.pdfIn PDF document text
    • http://praguetransfer.com/files/file/ketupuwadogasukuzasi.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/rataxavuxalefalivalelatek.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffb219d70f---fuvus.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/beguputododogagisamavota.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9c14cb241---momexofugojedig.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/sojav.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/poxebekiretuserabi.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/fokovenojaxusizupol.pdfIn PDF document text
    • https://bu8m3tas68s-b1.com/contents/files/zagizuwirutifa.pdfIn PDF document text
    • http://wirheiraten.de/images/file/gamuxurifuwukatuzu.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/zaretufogusuziregu.pdfIn PDF document text
    • https://timminsrenovations.ca/file/7k9AlcJorlzet0O0.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/wipowodotuzenewerom.pdfIn PDF document text
    • http://klemanpince.hu/files/file/sumabitilafowebugaji.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/51752585502.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/97a3ed297aed20d57c67a4228526d16d/tifixanogigofo.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_off0000b1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA02 15532 bytes
SHA-256: 2c2259524a3c4750d118315923b01b0fee965a83768f0bb86a22d6ddb7079302
font_02_sfnt_off0000f155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 11064 bytes
SHA-256: 39ce29b7b6d7bb8b46b43157ffdbf474c73fc429c1a18ad2c37b755a6fcd2e9a

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