Malicious PDF — malware analysis report

Static analysis result for SHA-256 281154fc201ea246…

MALICIOUS

PDF

91.0 KB Created: 2021-06-29 00:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bedde8e5c9fc3a0f1d941ab154454571 SHA-1: a4fd2f4446a9170502d99bb390404e3d661b3e54 SHA-256: 281154fc201ea246af47c42c9593f66af461b3c975f994401dd84ea57fabb31f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/dggssh68jl43of6pb5joq24f16/15554846629.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098218234282---20056113674.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/dbfad7a3f317c7ff8d0c8b30a167af01/6330148908.pdf
    • http://balogmihaly.hu/UserFiles/file/ranalavusovepikofu.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba005f39681---7071286243.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/833e1df472c1f29d4c14980c7575249d/12648903843.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/25994989669.pdf
    • http://zekidilektekstil.com/images_upload/files/73881273735.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/054a2370c800c64da2efa9e74d6ca702/jilegog.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/0j67ivdre2gtho5e85p0jj0lsp/38454693696.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e9958e20d---xujodujoge.pdf
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/kinetomag.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08fbfba916---64051459522.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5476ba234e---wejazukog.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720a3ed70ec---70791073498.pdf
    • https://delphin-restaurant.com/ckfinder/upload/files/24572639678.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/966a6147621af8dd017521fa7d167ef3/10670036566.pdf
    • https://accounting789.com/ThImg/file/zatikibawuxusa.pdf
    • http://www.anjhimayath.com/upload/file/90207255274.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160866559cb384---93924142101.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/de139b44ed177935b8cdbdd04e7392ce/dizumatixejutazekunuvijak.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/390bf0cfb91c77b9d1ff2f2cfb0d64bc/58743276529.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701becb56cd---68521112847.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=screen+mirroring+pro+for+roku+apk+mod
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea51.bin
a2794e832b191cab2e9f44eeb57154fbcca8cc038880a6b8014900bfc05a8c94
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 16144 bytes
font_01_sfnt_off0000ffa0.bin
ae9a6fe4aa35a179faaba6ff01f724746aab3e4cb730c7a62c64b22b81125f8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA0 17204 bytes
font_02_sfnt_off00012d0b.bin
49bca4cfc56c91bdeac47a95b87a963dce2e08ae6f36aade812eea7aa1b188f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0B 10916 bytes
font_03_sfnt_off00014619.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14619 16792 bytes