Malicious PDF — malware analysis report

Static analysis result for SHA-256 227ebc7e1561ff6a…

MALICIOUS

PDF

89.6 KB Created: 2021-11-02 06:31:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ed87c245987e8bc7b9c7da8736e30c24 SHA-1: df1f8d16e6a24aa8248df5df32e3dc151a90de0c SHA-256: 227ebc7e1561ff6aa0b5f622ecf9f63749893f9423ebb94d8ca7c81c534e6fde
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.retake.dk/ckfinder/userfiles/files/kejolukupaluvu.pdf In PDF document text
    • http://etcpremium.com/userfiles/files/62154943691.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/raxesudoneb.pdfIn PDF document text
    • http://msiutilities.biz/documents/lufewuvokamagodi.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/rurulazixotexiri.pdfIn PDF document text
    • http://moneymaker-gold.de/files/33391377455.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/senuk.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/temomir.pdfIn PDF document text
    • http://briztravel.com/upload/files/rupavorodop.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/c4mi7ck6bo6edvl5to7tsuqhd4/93099896309.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20211021_98E3161991B9257C.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/51121432704.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/53540659087.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/31657547603.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c5770162bce5d39e4d603fb81b3ba721/donutugomavokipibere.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/labopajeja.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/69268036074.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/fopupeguvitasogi.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/35159697546.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/85468045315.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/25181721138.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b1c006b5d91fbd00b52348592f5c14c1/nowodovexopotev.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/85687298361.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/14592529444.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/19379649462.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/98667206559.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/xezemumaginiminenasemi.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/TxADE9PCSUw/uplcv?utm_term=first+fallout+gamePDF 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_off0000f986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 18084 bytes
SHA-256: 8525c723e5f2ed8a75ebd57e503e0ebcf1c2914b25c7b4e74b287cd8f7094c82
font_01_sfnt_off00012856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12856 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001406d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406D 10528 bytes
SHA-256: c778bbb2de97f3f48b46f810e9b097455a87c4f7bb778f8c9f6296fb5023e121