Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f116aa1f2c3f7f…

MALICIOUS

PDF

84.8 KB Created: 2021-08-27 01:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 73246321a419939f9de917484b082b38 SHA-1: 4217856c8be67b68414cc29f80ae410d98b0c23d SHA-256: f7f116aa1f2c3f7f0cbd05746e3d39bf1769600d32c893c6c16628feb31e7d57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to lure users to external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://coretry.ru/uplcv?utm_term=thick+legs+workout PDF link annotation
    • http://mobydick-band.de/fckdata/file/59159939517.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/44675317198.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed70118206---74270196812.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6c92f325a---99824972148.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/83c2a0d75155c356e2dc49a8e65e4220/ravafoburatolizesa.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612182046852c---92927027428.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/libusak.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/dopokawedu.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/82949835603.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d989c84e81c---60534576639.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/90221596208.pdfIn PDF document text
    • http://htwy.com/upload/file/57742341030.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/32991072581.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/7075439eb5f0f59e98886e3819f8d632/116571724.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021060412423749.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/81115969260.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5c3bc03c7---21444483021.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/bf1eb11537fcab7020e6bfd9046081eb/59763290847.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/75518043048.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210803_BFF132069A99DB3C.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d990a88dc5---95236143974.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dbee94b1b5a---2073613554.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9270d04b2e---35937942002.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_off0000eb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 10484 bytes
SHA-256: 345c2e8398401722e848c752be6125f81d272ef4f1824f6bf37ebb8e04347721
font_02_sfnt_off00011b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 16280 bytes
SHA-256: 82458bc8a30cb221a46f5646f6ebb99668fdae5646cea6871415fc9674c4539b

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