Malicious PDF — malware analysis report

Static analysis result for SHA-256 8531788da40bc466…

MALICIOUS

PDF

102.5 KB Created: 2021-07-15 09:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a7af39e07786fd1ef81320b870de9c7c SHA-1: 3e3f5532321d415b12eb7e3306c9639329f8de38 SHA-256: 8531788da40bc466412147d296e4a45d9fa62b9090890c2cc72d0462cb6cf61b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or malware distribution vector. The document body is heavily obfuscated and does not provide direct user-facing content, but the heuristic firings strongly suggest a malicious intent to leverage external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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 http://ildongwire.com/userfiles/file/4920008041.pdf In PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075c042f2973---nenegibenoj.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8bbd9ef5f---95050985722.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/vodekewazazeni.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/874df554cae761b69ebe10f91d025a1f/84105484537.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/78429539346.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/35881080513.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081ff03b896d---39132510896.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/gctldn0965lj74u36pe9iv8tlt/kufevo.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/51nngsin1d3mtbkelok7knsvcb/bizoxinomosubena.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/mqkqhjddo4lteula9e4mpht99b/23559545794.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160972a422cdcc---41913206129.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/943a36c44dd3c0adf93c80a8673738ea/42298050144.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ldla7skbf4t3vvevilbfokha11/10264368873.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607656faf27da---jesejexavafijoxopamu.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/55586630729.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/68198107777.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9c31d6a6f---72681504966.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210626080919_6rbo8j.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/zisaviwejefevunivuguje.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/37610280807.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/71480d3f2be8a778242271b3e27b9f88/jagixi.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/gijotogagepimavunuj.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/73947044971.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/334085276bc304047e7b46b0d6109c9f/79708885746.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/1k2v8lhnm6o1h6vih89fh3cl3i/sudokulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=i+scream+for+ice+cream+meaningPDF 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_off00012c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001448d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448D 18088 bytes
SHA-256: 2e5411b068858d78f06c938d58f47c577d4c4fb6ffb0cb349a92ffc78542c6f4
font_02_sfnt_off00017495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17495 10488 bytes
SHA-256: 57d1e49a4466d60b1fe8150e37fa7b7bb16059d421bf5025b7636a7d8898fe37

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