Malicious PDF — malware analysis report

Static analysis result for SHA-256 d023061e15499337…

MALICIOUS

PDF

88.0 KB Created: 2021-09-05 10:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7c11fe6ab91a146aab3ec86f90c387f SHA-1: b0262fad9525e99dbf80380e73567287449ba825 SHA-256: d023061e1549933796803569ef9d24201066a722809065b1ccce6ac84e2bc33e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://rpdev.org/ckfinder/userfiles/files/vixodakoninevimi.pdf In PDF document text
    • http://marleenjansen.nl/images/uploadfiles/wonijumerug.pdfIn PDF document text
    • http://jar-ted.pl/file/kokimebalozot.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1866f4c043---48675207.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/94626039101.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/89091154981.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b19d1c4726---19030888762.pdfIn PDF document text
    • https://bunianco.com/other_files/File/xukoganok.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161146278c941e---kigedunanodemizor.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210827085822.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/88267390210.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/6df076d5b5d1a98134fe31dfb0b730e6/gutesapaxorojedokaj.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/wabegupaduvezo.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/ximefazisanibafojemitezak.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/fubimarirenuxetobixakuto.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0952617ec4---kotuzariwalaze.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/973c6f8c99bc34331698bdd739d9854b/vonodepodoguvoxugibokan.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/nagipadimarawe.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/gidirabumilakafeze.pdfIn PDF document text
    • https://campermagazine.tv/public/file/10820634388.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/79404708062.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/92644104390.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/gaxal.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/51804283115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+winter%27s+tale+mark+helprin+pdfPDF 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_off0000eff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 10816 bytes
SHA-256: 2e5118db7c8eee113f88c57b05cae3fdca94159e66a788a6ee3920a95cb90f63
font_01_sfnt_off000108cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 19160 bytes
SHA-256: 5841332fbd4e617384c90cbf114d58a6b00e7145e4fc0c6bd6019b9a5d35f73f
font_02_sfnt_off00013acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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