Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1ff2f977680f28…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 23:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9203ec627b1840fed40f5d92cb685423 SHA-1: 146af2943053c4d7e406ca3fb9de8aba7ff7874e SHA-256: 5c1ff2f977680f282734cdebeff8456886f25166a438121186d200aed2967b97
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. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure itself likely facilitates the redirection to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://tyextractor.com/d/files/nutejaliseku.pdf In PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/7264739328.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348ddc67cf6---73841131948.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/61170d5c5244c50bfe0f1acf17bb9a5e/vezofogetidabetoni.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135423163d42---vezufob.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/25796445722.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/sukexovotidelo.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/jenelizubuvewoxema.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/810ce14f316d98e6f683bc4310f5da28/tekosutufe.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/9540f0b56ed8eb65eb9a260b1c0af2b4/70811504921.pdfIn PDF document text
    • http://cssh.es/img/file/43316261096.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/36340537446.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/bogomesitenora.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/kenererejozilivapuko.pdfIn PDF document text
    • http://esistore.be/userfiles/file/gewede.pdfIn PDF document text
    • https://penzion-palice.cz/content/radeziwarovewiruzura.pdfIn PDF document text
    • http://rimi.sk/userfiles/file/dapetegabirasivutu.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/861889251.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/88476986975.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/68142912743.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/nineledolij.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613076aa49761---11732678316.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/97101225312.pdfIn PDF document text
    • http://mosjob.ru/images/file/davopanoribemofozozezover.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/nimivujajepanofejorom.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/lc9pbgesdu5deebotuffnkamrm/73376050935.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/41217515386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=war+app+download+apkPDF 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_off0000e031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 10068 bytes
SHA-256: da12a88b21072d164c57643f91c9122bda41989a7a2c7e705f7008a1cc224261
font_01_sfnt_off0000f6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB7 17240 bytes
SHA-256: 10156df676a2a62bba11968147511e4a24d8c043f6df4615281ba272fef0a740

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