Malicious PDF — malware analysis report

Static analysis result for SHA-256 912a5f4899860aaf…

MALICIOUS

PDF

81.2 KB Created: 2021-07-30 03:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 37974fd918c4803c926f908d2c7aee3c SHA-1: cd465c01700953e4ef9efb9be2ab8e34498f3137 SHA-256: 912a5f4899860aafa2d70d52a973f7430dc9fcdb3b478ecba80dc9ae34b3485b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, directing users to various compromised websites and disposable hosting domains, likely to download further malicious payloads. The presence of numerous external URIs and link farm indicators suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=jeepers+creepers+3+dual+audio+720p+free+download PDF link annotation
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4f10754a8---xagaledep.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/9kgvpreq0h8av19damiralcf1l/kewopogetuvofojomenepov.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160960aed8213a---21835904744.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23198580777.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/lilok.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/64689215628.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/4b6025322ea765fabc82faa7e7e5322f/32944621947.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8c887a2fa---45482237330.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/66249696926.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43545940835.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/janomutelubow.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/vejorut.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c836b1b41---vilimazuguzarogivomovu.pdfIn PDF document text
    • https://ksuskalology.com/images/file/96940132836.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608791f4ce601---49531590530.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609da7c0e8cd6---gemolup.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608126bd8a5b9---5258882902.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/2nvvfb9tfv8ellfi8r6brr0f8o/33256001844.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/poxojimix.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945a3816b88---wokuxesukeper.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/59783799946.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/4817404815.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/tululokaxekudarogoxesotis.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/60294706782.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_off0000d567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD567 11156 bytes
SHA-256: 6929aae7880a6622624079b3fddf4c59e95dd8288242078412fd64c5c7471d85
font_01_sfnt_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 17120 bytes
SHA-256: 28d2359c852be9da1b4d37a295cfed1ab02079fdd5963e54bbdbba569ca8c771
font_02_sfnt_off00011ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1