Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee2a46cfb628a69…

MALICIOUS

PDF

88.4 KB Created: 2021-09-19 20:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 405baab7294695ddef5c17fb04164afd SHA-1: ab5086e2e22a58237387eb90778315a1ea77be44 SHA-256: 4ee2a46cfb628a69d5af81a39b4dfe31d0d228e08e0192c6098c8601ce68ece5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users. Heuristics suggest it's a link farm on disposable hosting and potentially points to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crysiq.ru/uplcv?utm_term=psp+android+games+list PDF link annotation
    • http://tetrafluoro.com/upload/files/fakiso.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/suxagegoruwikenunelul.pdfIn PDF document text
    • http://melabo.com/upload/files/2262057384.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/litegofagife.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/74296798431.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/vegubup.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/tokezekubenuwi.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/54338002635.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/86218591449.pdfIn PDF document text
    • http://amkchem.com/upload/files/rulisiv.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/53866850852.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/viwupebonirat.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/2578cdbf4604972ddb80c6b25291c369/wexadezoronopelibiv.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/sibawiwiniwej.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/44276371149.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/44573098069.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/59195994785.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/78908751450.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/43608814977.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/xugedulesuzumudasopim.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/worekis.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3c625bccb32c81c3c0c7cdd48b63cdaa/nemifoponuxisajabaruku.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddccb391b0---39864902157.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/totedanorimowimas.pdfIn PDF document text
    • http://dharkaninternational.com/survey/userfiles/files/76367015196.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613d261a3aedd---berevalisu.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_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0E 18348 bytes
SHA-256: b3546fc5d4fce166d1a4affc4fff532455228866be361b97dfc9a91d0655cbf1
font_02_sfnt_off00013b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B94 10736 bytes
SHA-256: 7651b45450db4464461ae324b96c8953ac7c05791e0e6e90e762c9072479781a

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