Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4fe59aa924edc3…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 03:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a1330b4a3fa359cabce0bbce253682ed SHA-1: b15b2967bf1ac008ff0a1ae5a382242f8ac6ad6e SHA-256: ed4fe59aa924edc3d28a058d28bb176b41359012bac192f682358d663f87ded5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attack pattern designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cu-hinothai.com/ckfinder/userfiles/files/xifubonibini.pdf In PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/firililopifepolaraku.pdfIn PDF document text
    • http://goodline.by/userfiles/file/sedizerekuwujosa.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/63154056757.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/fomufaje.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7c3f952b7---41134759614.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/26584748007.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/4168771a84d90328d0073eedf226d750/62809871456.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/67163194424.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/80659575036.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610079f25550d---24437958227.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///2778927860.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d6e8d23c2---mevirafuposibaf.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/didexemibizibenukoxuvudo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/b1009d131a4d95014f253c2577ef36d6/babugexapumaxududoxapupob.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/e6fe041082df654287c37f5eab368589/20653293329.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/37814232618.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/dozokanaromojapitujo.pdfIn PDF document text
    • http://minicabii.com/survey/userfiles/files/75350325868.pdfIn PDF document text
    • http://shosholoza.de/file/gelutofatirolumetefogome.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/088362db60037379fc176e00ee81c11b/70706917792.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e816e7c7098---89336995100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=remarkable+tablet+pdfPDF 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_off0000dd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 17740 bytes
SHA-256: f605964d816bc0fb936cc9d02b1da68ec691818a5be80c101da8d9405716bd67
font_01_sfnt_off00010b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12391 10452 bytes
SHA-256: 3754ee677bd3e39bd65ec438e28a9e8b5a325b8750d907a7838d9610bec371bb

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