Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1dbe58d6b183c34…

MALICIOUS

PDF

83.0 KB Created: 2021-09-09 17:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d4dc8f387fa20017d245fe755c4f0bd7 SHA-1: b5e1c61e82dd39734d2acc0831a034c6e4824572 SHA-256: c1dbe58d6b183c34b1b7cd688961a2debfbbe67cdb88e7b82fdd990b52baa10e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=rummikub+mod+apk PDF link annotation
    • https://777mto.info/contents/files/lenekiravupimowutaj.pdfIn PDF document text
    • http://tchid.net/userfiles/file/18986045532.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/suxinumo.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/98982229033.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133f87872c7b---68798013679.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109031523387560.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/73828806219.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316391cd524---75488029104.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/7023580021.pdfIn PDF document text
    • https://orrizon.ru/images/file/dubowodedo.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/21170089354.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/61633302156.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132f40b0ac32---fezojasolijelenisokejijiv.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/pajavusarutokafozuta.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/48579927365.pdfIn PDF document text
    • http://synfarm.com/upload/files/wolesiziwufuso.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/dewigudegowaguzutifadug.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/gozowuraxabewunozafamiwu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137be7454819---gifuvada.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/lubewufibikukizigi.pdfIn PDF document text
    • http://stonebreaker.at/dagesisijewesu.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/walokeniwiza.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342a88e6a72---wepokatisonelasexaroz.pdfIn PDF document text
    • https://hobbypet.cz/files/file/46190595341.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133b6534e850---30910461764.pdfIn PDF document text
    • https://robertbah.si/files/file/31990243047.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_off0000def4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 10284 bytes
SHA-256: adcbde9950c58080d1fb3890a7394c42f375d54ee63324923d7e143f99500716
font_02_sfnt_off00010de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 18720 bytes
SHA-256: 683fdbc08fad87c5767daf5f7b31cee6d9a9b0f0d6e8f79e17d39e2fd5d94c0a

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