Malicious PDF — malware analysis report

Static analysis result for SHA-256 8377c2c5629e9fcb…

MALICIOUS

PDF

84.2 KB Created: 2021-07-19 00:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1f206bb1d6172787f9e94c2a7c8c6fb2 SHA-1: b515db7ac2cdb86db8595f9b0a1b9cc2c051ac09 SHA-256: 8377c2c5629e9fcbca0b9a721eb94a8a4f2e9d22110f54e4dc52f914658751cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to lure users into downloading further malware or engaging in phishing activities. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://airflow-skateboards.com/upload/file/pokaladix.pdf In PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/14ec21b6934539a46e66c1ddebe4df42/jixinuwobeje.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/2310205490d520b7d7e16baa789b278b/moxajimesilevoxi.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/8n7jvgcmb2khuv4q7p43vbujkt/voberad.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5dc40f273---zukodepitifuva.pdfIn PDF document text
    • http://bienbao.net/uploads/files/jetavumetisikemedifunutu.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb5989b46e---wuxumosekat.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/34374124463.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a40b7e1628a2cccaf491d2a47e2e03e/puvavugokisivagone.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/13184913353.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ziremusilu.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/37144783105.pdfIn PDF document text
    • https://areicon.com/images/file/86369417263.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/bigomelavamipejojavokefo.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/lisir.pdfIn PDF document text
    • http://maksimetall.ru/files/dimemavude.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/49813483580.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f86b2218c---13614540616.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/63dcf3a45851fc5b397bf73a7842b02d/fokavetevasixaderojuzel.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076372adac60---38873579610.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/77905687376.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/78760066623.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/fatipexuguzupez.pdfIn PDF document text
    • http://kotolantopeni.cz/file/66664492862.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d2045d48---wunomusisul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=long+a+sound+wordsPDF 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_off0000e692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE692 17708 bytes
SHA-256: c48439044e6f09220e6a6262909ba0d412ead03ea7a0f02c2550bf62604ae1ec
font_01_sfnt_off000114cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CB 10200 bytes
SHA-256: 77da3fdf7e3b95264c2ee26cdd46fc39d07b653ac04bb86f633a54473a3daef5
font_02_sfnt_off00012ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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