Malicious PDF — malware analysis report

Static analysis result for SHA-256 589e6d9120ff5e68…

MALICIOUS

PDF

83.2 KB Created: 2021-07-30 14:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: db950f50b747530c166515e72dbd2015 SHA-1: 9dae10b8e6fc827d5b9967860452b4c019d656a5 SHA-256: 589e6d9120ff5e6854fbcb0d72e954fb85d1ec7ff4951ce820b0eb98949576f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous links on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://kino-cosmik.ru/sadm_files/kidatexodutuxaxumivol.pdf In PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/21109846467.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/wimibidasu.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081a8e8c832a---97200443008.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/36adfa59b1287ad28b26f952089c019e/rubapemufiwajubogijeve.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://jyjwqj.com/uploadfile/file///2021061107141785.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/68680435767.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/judososu.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/lhl0sh0i4vfofbjq7kdv7rs9sm/nureronufalanozaberejepu.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/jutezunubimefeku.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/pazovajo.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/pebugukejufumopul.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9274bb152---23399953855.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-24/20210724073105728263.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/0adab41bce0ed1edd0057e820c665cae/32323027439.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/2bf644b78cf02b318658f443d502463f/91772514153.pdfIn PDF document text
    • http://abwrva.com/uploads/files/sojilazonogowuvugononagu.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/1a67q0qa85bc15peb0319dsch1/jufem.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/3e1c50c3fb2c38ceed6c2a74ab69b583/tinesimudirefiwutegali.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5abfd0f4e5---fegop.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ef17bd8b1---95694291794.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076f302e3154---41478926452.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608236cdb9323---welakuwirebumudufuwut.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/mazanenutiwa.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5473422604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=my+hero+academia+flash+game+unblockedPDF 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://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_off0000e311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 11264 bytes
SHA-256: c3d0b6b4c984b9bf67f91ecd02f514b5f20c12d2938326afefe03b4ccde36654
font_02_sfnt_off00011531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11531 17812 bytes
SHA-256: d51f334591e2179d19f94b13a995c507eb1e0230447b1d76e24133917dabf2ff

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