Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30586308dfef00d…

MALICIOUS

PDF

78.6 KB Created: 2021-07-05 13:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f8d975a277fb3fd8829d57a58ac6971 SHA-1: 0badf3962945c3dcc31b505a6294375ff1d7444b SHA-256: d30586308dfef00d156041903c2b0b28bd11fcbb4f2baceb35d8e594a1c18a21
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=tamil+devotional+mp3+songs+free+download+tamilwire
    • http://slippersymposium.com/clients/875641/File/telefesufazufalotufev.pdf
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/73172092116.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be53ce7dd67---mavuwetopupelulekemasuwij.pdf
    • http://avvocatoandreabruschi.it/userfiles/files/4200361852.pdf
    • http://kimandyoo.com/userfiles/file/muleziwijalo.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ad788e79dde108f9282b36818e3bb73/zedipokusi.pdf
    • http://yuha.be/_files/file/15748905389.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fa91d9c5d29cd5abda8642566203c73f/90008719103.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a73e76f2663---kogom.pdf
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/27970273876.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/2d25cd0790b5e952956d4690bbc0ed3c/soxugufuxuf.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee2d6141a---29491770480.pdf
    • http://zkojicin.cz/userfiles/file/90718911800.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9f5cf8ea959aff873ef84a4ade3f1673/43082551501.pdf
    • http://flyags.com/editorResources/file///kapupodobimalefux.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1687d0e12---55443838369.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16083d14be7b18---niwodawuwujolunegigoponam.pdf
    • http://bigxra.com/uploadfile/file/2021051415034573499.pdf
    • http://joy05.com/_UploadFile/Images/file/joxisimiz.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/6tq8qe48gp3n527ero03gsfjo2/xefapuxesojivafipudaw.pdf
    • https://dichocungtoi.com/userfiles/file/bisuzibamezutabipomipu.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087da0840ac6---35170848990.pdf
    • http://shorl.com/kalotrehabrygu
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC03 16792 bytes
font_01_sfnt_off0000e41a.bin
9457960d5d7c14270e3dc2cc9720ded6e8846f65d86c792af5ea09b66c4ee367
pdf-font-stream PDF embedded font (sfnt) at offset 0xE41A 11128 bytes
font_02_sfnt_off0000fde6.bin
3f423a9785613d321d5c0bac814438a597304924777254a695f9d8e5e0e5cf1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 17716 bytes