Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd509bbc8c4cd10…

MALICIOUS

PDF

80.0 KB Created: 2021-07-09 02:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: faf862a7baa7932e36d04501bda7f2af SHA-1: e9436289e08306be3ca17e09dbc8a2a9f98ba49a SHA-256: fbd509bbc8c4cd10bbcf3220932e0f73bc0cfd7e3c6f2de5d7ecc201c7dc97aa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=simple+c+programs+for+interview+with+answers PDF link annotation
    • http://feach.ie/images/uploads/file/zezikukinoladanagodo.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/d7e0c95ab872a2bf946683a08132b368/4351847137.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/zisixijapegakakavugo.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/86308708313.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608487e38fb0b---senusemaxuwim.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8b8faqed0huvta03e45u6jak45/vedevarovuko.pdfIn PDF document text
    • https://actorconseil.com/files/file/vitawadogesafekuwilukel.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/772dfe644f2a5aa886b5e34e8ac38bf3/gozamavidato.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/32175074814.pdfIn PDF document text
    • http://mosjob.ru/images/file/nogos.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/4878dfab1c6c2e54b67da051ab7e181e/32692174691.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e85a28fba---xetumowanevilog.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a79dd8809b---91574137856.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/63886349035.pdfPDF link annotation
    • http://lnimeina.it/userfiles/files/jusivaduvami.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/af790f3884e8cee75abbd8b090af9d69/94887597201.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b293090bd3a---86428161125.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/2ce3a91c43d2fe404ba8e25a6e2339a2/37827402438.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/21708034198.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/14407298384.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/dk93vijusoq6g5237hp9o40b3l/12439161448.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/e09d8b992367e2f32426e4d16c5441aa/45774231274.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/29828388425.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160816a36ccfc5---fazorugoderipudosov.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_off0000d21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA34 11156 bytes
SHA-256: 7e55f6bbeb53a791f727826651d86e9b87d50b105ebe0950e0426066ae755590
font_02_sfnt_off00010418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10418 17564 bytes
SHA-256: 875d98b2732f2d0534140734948b07a8c56ae3a66533babf45a10ee2a9caf914

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