Malicious PDF — malware analysis report

Static analysis result for SHA-256 6019866663136724…

MALICIOUS

PDF

76.1 KB Created: 2021-09-01 20:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7afe446ff47511e21f35a53a227f5484 SHA-1: 4e63cb349aa47dcfa8b6745ce42220a6db659816 SHA-256: 601986666313672436f7025109dc12d57888f934c5171536cc4cde53cfa833a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites 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 malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://krisoc.ru/uplcv?utm_term=rudolph+the+red+nosed+reindeer+and+frosty+the+snowman PDF link annotation
    • http://www.cerel.eu/images/wyswig_images/file/wegomiderumimugimajota.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5855849b8---25097931833.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088280a27f13---56146079566.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/somaxoxaxe.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/25760973907.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/24506146404.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/xawuwabejanoge.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e878ac082---24024016131.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/22214287507.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a50ad3a2dd---kilinijuduwil.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/1b0f799f22be78b7f3cabf41e5ff1e44/43432423111.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/wamufowigu.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2113a93b14---83530728991.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/t58984sgcb1g5pec13rgj7o871/67451710182.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a354d36fb22---jivavetovugab.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/c8450e1c0be7f19e5b8267b7f29a80c5/xalupojorujexovoxosu.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/marajipi.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/18572354146.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/8785201050.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/temajeda.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/metotujenaji.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160aafd4277396---77023727457.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160985ce085ed5---93183327056.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_off0000c01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01E 11108 bytes
SHA-256: eed2d4ac3ee604488d7ff64df403653003f86d7e09403926fcb406f88046e3ac
font_01_sfnt_off0000d9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 17812 bytes
SHA-256: 52ccb45b842a5cec67e0758c05cc05a995f8a46a72cbfde7d205c18270a5df8e
font_02_sfnt_off0001087f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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