Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f78c821cf7f4691…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 19:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dfaaaaeb1010f92c6a2f4cdb868626c8 SHA-1: 12c4fb70172e2b638a7653eded1ebc899125cf3f SHA-256: 5f78c821cf7f46913c10f801a06fa371dc54c4e4f3fe4fb8eea68d25204263ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to domains identified as disposable hosting or compromised CMS uploads, suggesting a link farm designed to distribute traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns align with techniques used to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://duancanhotot.com/upload/files/rezivozukupudewatap.pdf In PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401a7cb65b9---juzemubudunofikonufesozeg.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/motisenegubakejawonuwiti.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/41408812350.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/ranoxogikoxigozefepabef.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/julixilegexuperuvodu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135664b32920---bamesudowisubazasikimego.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/61047752203.pdfIn PDF document text
    • https://poker-fire.de/file/fuvinatifa.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/75824126284.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/jozobojibedavuna.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/nimobituvavixobi.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138fafc985f8---29095730100.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/90533555191.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/3171732614.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/xufozegetujapuro.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/51427241554.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/fef33047bd62586c473b7c65c619f943/xiges.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/94144703291.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210913_194809.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/jovodag.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/87851636507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=websites+to+watch+telenovelas+for+freePDF link annotation
    • 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_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 16680 bytes
SHA-256: f4cea1b8afbab118fb0b98f8d90ffdb0cceea975173bd92a826be9bfa8fb1c1c
font_01_sfnt_off0001048d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA4 10720 bytes
SHA-256: c040b77237966963d67a4740405305e9bbf2a4e436818ec61c1a993e1b492747

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