Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03b1a92b9b40b7f…

MALICIOUS

PDF

87.7 KB Created: 2021-08-02 12:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c5cf6fcce56619a81cf11f2afc8112b8 SHA-1: 268ca874758719dbb759be754167dc3a01bb2eb1 SHA-256: f03b1a92b9b40b7ffba8d5b468677b6753200eb1ea577f44112c96e4ed1eedc5
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The file's structure and numerous external links align with a link farm used to obscure the ultimate destination or to leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/14d71e3b22cac262864d85c898fd7d01/xudopifikomaxesunekinudib.pdf In PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/59658117710.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/61722199319.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/chqthr1fq99vcrcdm3uv9d97rd/88498665176.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210606041758.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/binojotinasovokijaj.pdfIn PDF document text
    • http://www.toptehnik.si/images/63868003935.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4b8ef1c3d---43643150330.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec074f068b---gofivituzu.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e409913935---51269167811.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609af9432367d---fedupazofin.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/90856145944.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/a0a3a72e7c6059bad0612b2bf96146e7/18592946187.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/walusazidagilof.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c62b16e2083---89395672576.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/kojusam.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeb373eefd---53077164426.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6823603b3---bupunefoxadetububisemidu.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/rutijogadetosigogofekir.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/aa5ed3b45727f8df6cc5c57fa5ef019c/zujesunaretesil.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/8437042929.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/9abf14cccd8349054b4211eb0eb12f25/3461060312.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210701185459_pm6f5m.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mini+militia+hack+version+download+unlimited+health+and+ammoPDF 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_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 17540 bytes
SHA-256: 150fcaf19385714ecd345262598b143d5283d8864f3d6d93a03b4621dee69652
font_01_sfnt_off00011d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D25 10972 bytes
SHA-256: 240c9b3bd59b135789aedd92530fcf39b5c368ec3af89ea4dd7ec3b84a1bd9ed
font_02_sfnt_off0001367e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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