Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1fbd335ea478d17…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 01:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd06096948c5c4058bb7e7f095657055 SHA-1: ac813993dcfa2dee711297f3764ca26076189e68 SHA-256: e1fbd335ea478d17de8dd432808fba3aabfaa302a54875bcdb0f0d75937d513f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan-d2568dad23a94d95'. The file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to lead users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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 http://studiolaviano.it/userfiles/files/tajetefel.pdf In PDF document text
    • https://yuvasarkar.org/userfiles/file/ronimobabebuterizedu.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109100017496277.pdfIn PDF document text
    • http://farmina.ru/uploads/files/zefusugugijafito.pdfIn PDF document text
    • http://venkateshservices.com/uploads/fewagafidagemovinixaxunuj.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-13/210913235043987787vzgpofhdledu.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/60788088063.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161321edbbd76f---26821612040.pdfIn PDF document text
    • http://pk.mo/userfiles/file/43522289252.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/47283846626.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/filajifi.pdfIn PDF document text
    • http://wangnatheater.bpi.ac.th/ckfinder/userfiles/files/tamejavubuko.pdfIn PDF document text
    • https://christianschoch.ch/userfiles/file/61262809445.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210911193010.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/63229787104.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/e5b7c966a55a0f301180c756e7c9888f/42948153619.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/bilenixe.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/52772653271.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1ff1a98f6---15935380214.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/dedel.pdfIn PDF document text
    • https://wrd13.com/force/file/biwobexed.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/80555350721.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/34415397696.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/netufepodijexabibizoju.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/81148345853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mobdro+apk+updatePDF 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_off0000de16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 17092 bytes
SHA-256: 665d441128fa06dcafc68fc54b7426f1e2e3b0c868355ff9787255f2592f0c72
font_02_sfnt_off00012249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12249 10300 bytes
SHA-256: 3ba62db42060637e710f58285a8db96ca8fd366d9243db71d280434dd0546843

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