Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5948397802d0ba…

MALICIOUS

PDF

89.5 KB Created: 2021-09-20 21:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0de796befc8c90e7639e69362fb79800 SHA-1: c264cfd7c32ffdbb7231fa85afde81073485ff05 SHA-256: df5948397802d0baccaf51db52b2b5a0aac11ea3a5ee651eff70ace007518a1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The presence of these links and the heuristic firings strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f49c03db4e2266a391d717432d15d4c2/xerevox.pdf In PDF document text
    • http://learnersdigest.org/userfiles/file/pabumopokujetipajawolu.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/jedasiwipagobeboxesiw.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/72255254906.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/verodujebuzuke.pdfIn PDF document text
    • http://chromavials.com/d/files/18121346965.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/60693257805.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/48530407916.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/furikedugejilakuxifimew.pdfIn PDF document text
    • http://stylekd.ru/files/4963986355.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613901ba7a9d1---jivupeturuxugututodo.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/zegamobukezogesumemopesab.pdfIn PDF document text
    • http://platcometals.com/images/file/60318017435.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/3380386516.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/vakowesenujefisusabaliv.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/14111756608.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/guvupozudimupodavi.pdfIn PDF document text
    • http://samtle.net/ckupload/files/20124277936.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/23418924190.pdfIn PDF document text
    • http://feminella.ro/upload/fck/67830077723.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/semobofexino.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/pitodileliw.pdfIn PDF document text
    • https://cecprint.com/images/file/petupumor.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/kekalofigodejiwufexexiw.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147bace72e93---92896795780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=samsung+galaxy+tab+2+wikipediaPDF 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_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E88 18252 bytes
SHA-256: c8c9f0e0ffc8ea034c88627ce6844706ceccaa0b96fa6323ea26b324926720e7
font_02_sfnt_off00013d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D92 11344 bytes
SHA-256: bf9cf78bcbf0a2cfc592845cfcaf8507371691a25f799277eff4b5f67b039b8d

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