Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5c553263c9e0a8…

MALICIOUS

PDF

70.7 KB Created: 2021-09-11 18:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 957855ea9fe069ac6f1d43e8335e028f SHA-1: 09b4a0b3eccdbe93d66e6507cd209cebfdca4668 SHA-256: 2c5c553263c9e0a837de49bbc3ee4853a4a46dfbb92453d74e54ca97919ccd9f
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URIs and the overall structure suggest an attempt to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5522

Heuristics 5

  • 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
  • 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://infrive.ru/uplcv?utm_term=download+nox+security PDF link annotation
    • http://konakelektrik.com/userfiles/file/24960327634.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/15292761229.pdfIn PDF document text
    • http://spharma.ua/files/file/91721726228.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16138135d019b5---4073231583.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/02135557400.pdfIn PDF document text
    • http://snsi.jp/image/news_file/garegirafimaso.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/5400332308.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/zufowifewirimivorasowes.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/71557299485.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/vutibonuvija.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/18696314062.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109040053013145.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/44697607948.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/11652266529.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/wowefufugelewefujikeruber.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/25080859253.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/mumoxowesebufasofola.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/12697029856.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613991c8060cc---pumegajokexexoposaramux.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2e6b9b000---bolopefil.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132ee1987450---mozivusakelelunegodub.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/bedemodafaxed.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BA 10768 bytes
SHA-256: 4d5b5bf7e59c94c925b5650de151c8012672be60720eb556a73de8e6e1d1a765
font_01_sfnt_off000100bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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