Malicious PDF — malware analysis report

Static analysis result for SHA-256 c188a25e82c92df7…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 11:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1a1022cb34d7d1365f7d1b90856f59a8 SHA-1: 2807bade916e63fdce10adb7531ca70f416b6040 SHA-256: c188a25e82c92df7601068662969cd6c0cba4cc8a0acd973240af6d6d76e41db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://huntic.ru/uplcv?utm_term=horror+games+online+unblocked PDF link annotation
    • https://sieseam.org/userfiles/files/juvugizi.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/dajivilonunisenorikarodu.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613873c38890f---jebexoriwo.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/konenoxojemijopopegejoto.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/totuvurotegen.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/wuvujaxivebuvowude.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/63918671389.pdfIn PDF document text
    • http://innotack.com/userfiles/file/didadegigulat.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137501d99e7b---bawog.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/45995320958.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/83825186252.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135702cf2e0e---65735183178.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/59974337824.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/56820371364.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc2e96b7b7---ribefepidetuganevuw.pdfIn PDF document text
    • http://deauville.ru/files/file/86532850192.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/dipemunepinafibugi.pdfIn PDF document text
    • http://showpelec.com/data/file/20210912_203617_355.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401a7bc52b9---xawaboboxolojalode.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/fapifunozulonol.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/20742386259.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/19261134186.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/46299941313.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e68a8a3efa---fudemifazonipusuvawopeju.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_off0000dd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD61 17396 bytes
SHA-256: 65cbbdfe8d91f9539fa0f76b74f20b884e882c44801c0cdac369af42819cc0fd
font_01_sfnt_off00010ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD8 10940 bytes
SHA-256: 5baca128472a21870a9dffdc002293c4748cd530c279a249288cd632765fc4ef
font_02_sfnt_off000123ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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