Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe91ee36f6410ec…

MALICIOUS

PDF

81.9 KB Created: 2021-08-24 10:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c740436b9837ce6cf35c3526b7c90ee5 SHA-1: 8a0884ad097117963076edf313b40798e2b9ee86 SHA-256: 7fe91ee36f6410ec25c8db5ea8f0feb37b69e4e3c0c9b6edcabf96de8398c4d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with malware distribution or phishing campaigns, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://irlanc.ru/uplcv?utm_term=how+many+bottles+of+water+is+100+ounces PDF link annotation
    • http://longthinhphat.net/uploads/files/84396445744.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/67808614318.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609237abdfbd0---32968461649.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c36aaece952---91212690689.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/winobi.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/jf9dvfc9chk73pa81vufms89q6/46306978987.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/rirazofavumama.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160aabdfdaa405---82247579045.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/78105367972.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/09abd07b01713f0b05b2fd604035e903/10596869366.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/feretodowapazijikopitofo.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/pakolikevogovegum.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/99356765406.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/43782923940.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/1e03e38b6cbb90d94ee0b2cc680b8443/buwozegamofazuz.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/tukapagikeguxunuka.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608896e0e171d---menodexun.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a5c487b46---84496778343.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/37990975874.pdfIn PDF document text
    • http://aplus.to/userfiles/file/duripavejinasetasod.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef3e0aec9d---rajikop.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/61103306469.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_off0000d8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 17468 bytes
SHA-256: 6f270a05439362d79d200fd10596b007e4d4366fc16cb0eda37ac698884e1587
font_02_sfnt_off00011eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB7 11100 bytes
SHA-256: 9a8ea4d1b245f568b8b5790689365e184b9581f99c4168656fe535179c804510

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