Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9a663128fb641c…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 02:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cdc60bd58322f770c05cce2a9b1dfd55 SHA-1: cc2341a8e35e00d7611dfdcddb91ea4b9939baab SHA-256: fb9a663128fb641c120e735402213ec9d3026fc1c56e169acf06eda7231dba29
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern appears to be a phishing lure, likely delivered as a spearphishing attachment, leveraging the embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=goldilocks+and+the+3+bears+story+pdf PDF link annotation
    • https://sport-jicin.cz/dokumenty/52333973303.pdfIn PDF document text
    • https://5udua.com/contents/files/55443292500.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210916_18CA3FD6521320C2.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/ketutizupigitigapunexur.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/jedulevekoxikepuxof.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/19095721335.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/moxizisipeke.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/59394260225.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/dafuxudodepijof.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/43702598794.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/wurusoditenabes.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132ffe36235d---70191340482.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/11067602269.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/kd4slkh17sdtgq721k8o664hmg/pejogivejojurukojibopavu.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161315250ae7e3---lakufabubirovizej.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/1356660807.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/kuvemigif.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/44493050415.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/45924211846.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/30307989276.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/37229192050.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/33190423886.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161429db91a831---36815112514.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/nigija.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_off0000ddbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBD 18844 bytes
SHA-256: 2e1263458f8149dc0a0229fa63c64ac1fb2b9e518ce7ee99c9d4687052e3b475
font_01_sfnt_off00010e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12620 11272 bytes
SHA-256: 79ac7b5f62c8b5cd11930c95e3818b9aa342123820f746e4f8a4e84f4d2b0e71

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