Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0af59d1975c33a…

MALICIOUS

PDF

77.0 KB Created: 2021-09-01 23:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a08ecda51f6016a24aa8f26c0e1cb919 SHA-1: ae91d7c5ab5d86438e97828ceb3721298175d489 SHA-256: 5a0af59d1975c33ab30377b428f6ba2bcb8c5165997a5d603ea151b3c24bbdf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://valubil.com/public/uploads/cms_file/cms_files/zetotuge.pdf In PDF document text
    • http://jyjwqj.com/uploadfile/file///2021081601243618.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/4gdb7q034b0uia6vi6pi149el7/banuw.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ad8c8213543c398827b5e648d6a5d8f4/34804393186.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/zubuzoge.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/0iukfr8vpuqcka57umqraagbp5/zaxap.pdfIn PDF document text
    • https://bloc-immo.com/images/vigob.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/79009460770.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/39407240995.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/mekidedegi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/fd3a797d76d48c53a715339b4cb58eb6/paliwesewawelumi.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/79j19t6ips6p9ov6u366ptnnts/jonavazuwafetama.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/worodidokiwi.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/c32c8092c53070a5d72abf7e48ff36ad/todamuwutevezewepi.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16090dfcbbe0d8---zonur.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/8147871223.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/3d4897ead62e345a8010abb98505aa27/16843015861.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/76262693742.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ecf0fcf4f125c9b50b08af20a17cfdfe/filokekepoxifopuva.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/71915930712.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/posapasagutagarewoxani.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202108100028466012.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091027899c09---45510815084.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161137b1fb3635---pejug.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/d045f485511f02497364c292052a7246/89151577517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=assassin%27s+creed+odyssey+lesbos+artifactPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/xuxagumipoporenoruwegag.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_off0000c96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE181 16696 bytes
SHA-256: 7b56aa3550e3efb3803ca9f36444e33b06aa9368570d542252c4a3a1c7fb070c
font_02_sfnt_off00010c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C62 10740 bytes
SHA-256: 56ecb21720976e2c35932696cc4470b1c671327f420ca5d5b8993df62fb03187

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