Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d912c3ab779c2e1…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 08:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 18f6f30a1234dee4a49e9a69b3ad6f98 SHA-1: 8a5ee00cf0862a79291b408a9f0df2a0162b2327 SHA-256: 2d912c3ab779c2e105f95cb58d6ebf2c61b1418e54d605494a2ea572bdc365c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to redirect users to malicious content. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=rewinding+motor+3+phase+pdf PDF link annotation
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/0s16qj4tuchneqgiidaaq9k1g3/bujaniviboxiritigereniwuz.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/4571094028.pdfIn PDF document text
    • https://mattress-leader.com/media/pakosawiranosenumu.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/56c2138ca24d890017b711f8c4fe9ee4/77475544540.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/nawetalosetowetogesewep.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/difidosibamuvotujol.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161032a8b584a0---bukijolilobepa.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff51eba14d---59842271101.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/14236631505.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/bolerigozivaxor.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/tojos6iqbjv1dida3qqoobjkv9/soxerinorinuxivikimine.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6e227e1ed8dbe5819ac397a48860fc63/96054962904.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/konagogirer.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbbf4534c---xeponubuxazedojej.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/aeb568dac472f4d5d8ebdba536fb34f1/dafun.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/2a906678f31c5a5a7204f34bd78c4310/52303412699.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607c94046a33d---73347450792.pdfIn PDF document text
    • http://jimmartinfamilyreunion.com/clients/35696/File/wujajozagikobavuwot.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e331411f094---92717831353.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b15121d604d---21862731219.pdfIn PDF document text
    • http://stylekd.ru/files/vubedabepuzi.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c033de07f---2096046982.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6c92f7ed499e29b69721aad92a5bf052/55601802299.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_off0000e784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9B 11200 bytes
SHA-256: 8ce94b5759ea1b2ce186327eaf1aac9485bfbce53626047a022a73724a994488
font_02_sfnt_off00011980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11980 17452 bytes
SHA-256: 9a63f31c7c5369b750b43fc2dfce15cd61093c8155aec6d0dc0a3d2633847312

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