Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a31aea7c02277e4…

MALICIOUS

PDF

90.8 KB Created: 2021-08-12 06:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d5be93d1940047975e5ec636e58ef72e SHA-1: 35acf16fe00831fd867ab7fb63c239b50e7b1419 SHA-256: 2a31aea7c02277e4999bfe2bd48d40eff58eebfef684f9453c745ea3de7dbe5e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to external websites, many of which are hosted on compromised CMS uploads or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2ib12geicerf1f8r0nrb9hjrds/70342107855.pdf In PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/edab45f2bd31a66e164d536a2caf8da5/71398283212.pdfIn PDF document text
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/fdac020db6d86af6a59e4fd4d4c62bb0/68078462434.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8d855d6e4344cbc68574330dac660918/joromiweris.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/32324134540.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/batotunadezik.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/ae93ece9e46d582ac5231af9a89938ba/35252088862.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607433c94060c---rikutinij.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/taginizaluvugagum.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/lelolu.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/59276772892.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/ritotowitaz.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9e5e3f74f---xudado.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/561556453e9b2d19d7119eff6a9022ea/57411309386.pdfIn PDF document text
    • http://www.polni.si/Images/files/zadawusumebepimaloda.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cc3c5ecf7---dakonotopofed.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/rijigezumasijovoladil.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/popije.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/47466893486.pdfIn PDF document text
    • http://premsaktidal.in/userfiles/file/81197285171.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee828465a3d---27505234302.pdfIn PDF document text
    • http://momsystem.ru/public/file/geredudufo.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210720204812400988.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7f1b444b1---41342898509.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/47bac833a453a050e30606b953fae2f8/45665610340.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16074748493e2f---88022166901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+you+start+a+college+essay+about+yourselfPDF link annotation
    • 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_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 10888 bytes
SHA-256: a3965cc1248f82bc5121a079ff1635c482db9340dc4ad93b7458f648a25eb336
font_01_sfnt_off00011abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABE 16460 bytes
SHA-256: 373583a846d4e3ff98e533f74d257dc13fef17cab40d67c39259192afde19f98
font_02_sfnt_off00014502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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