Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f1079159c5c0b8…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 20:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4fbb5dec3f69dfcff01d77116d631bba SHA-1: 2137d213e1798db5f0b8143a5f3a81a078744f61 SHA-256: 31f1079159c5c0b856ecd9fdf44fc90284884bf9b3180c17f0b96a69e7815463
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised hosts and disposable hosting links points to a coordinated effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://crewmak.ru/uplcv?utm_term=non+municipal+area+study+certificate+pdf PDF link annotation
    • http://ildongwire.com/userfiles/file/gagemage.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/1653187643612f320790bf4.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2dc79e651---dinixus.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/96984795434.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/ec2ecda1a77356379ccabec3c9422969/pufukinosuxivilovafepa.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b563f163f3---pujusutijabogapitebi.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a29e9d54fee---76504114564.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/weluzibiworosafetawe.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2717486f6---wufikoxanixusukenosimed.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/86220214011.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/dinulutodusasowidad.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/89937192511.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/tenud.pdfIn PDF document text
    • http://ore-processing.ru/d/files/44350312972.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/81478402742.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/pamanumumuxoxazasotefot.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c1e24100f---diburufewerakow.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/70250368375.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/volagowoj.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160760575a8d60---28485350926.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/pukezazexizomilepoz.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/reguwudetaxekeposovam.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210724214959.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a5ab57b150677513355f5e643c8c153c/76588687785.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161299c13b2489---60673645164.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_off0000e42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 18480 bytes
SHA-256: 99184458aa5c6300c814d7b7cba941d4588423aabb45738ace1b1dabd99ab402
font_02_sfnt_off00012c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C56 10972 bytes
SHA-256: a89c44028c47e4a63d16840b6db4cfff9be1c11785652e8cf6e874a56fd952a8

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