Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c04d1ba99a7b94a…

MALICIOUS

PDF

95.2 KB Created: 2021-07-06 08:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0e12997e2917470ef6e94558a8f16d0b SHA-1: 518c5ee726641dcd789c46bcaf1a0bde3cadd9c4 SHA-256: 5c04d1ba99a7b94ab4bf8315d62ca77168e908fffca9787a9ea75d2c1271c031
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://allytemp.ru/uplcv?utm_term=when+we+ruled PDF link annotation
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e20584eee---tizogirikemizagevuw.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/wexubalazuburorumo.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/74156651726.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074836aaed14---41951814601.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/36090366606.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c53cdd2c91e---21465432690.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b9b047cd9---tatiwaxiribi.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bb72367ae---48004320088.pdfIn PDF document text
    • http://novafish.it/userfiles/files/wojosifasukina.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/42102565437.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/3742639653.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160932a0c36908---nojebafalidaxurumexum.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/61782492384.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf30c42a21d---58525740845.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098823b6ccfe---75598575971.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/ee0dda149103be1b82ed4756386c4ddb/ditowo.pdfIn PDF document text
    • http://jarosi.hu/files/file/64581867274.pdfIn PDF document text
    • http://atek-ent.com/upload/file/movelexezikawawepego.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b330cf2a039---81407607331.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/nomum.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/44f3c10521b118a36ab97c884322ac0e/vefomubafefokebazi.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c31c7160e87---vibabobosud.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/8smilf46ouipl0mj1mes7at6ln/88407861733.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/peximujexefajevukujakuge.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_off00011468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7E 9884 bytes
SHA-256: 28e93293881372c5300875dc81c8b1cc86eb41d093fd32ea5474ad628f6a43c7
font_02_sfnt_off00014228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14228 17552 bytes
SHA-256: 3aecf6d0dbff30d1dd071cce2fe269b0b13afb0c23267ed956519ae44b0bbb6e

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