Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a8962659b3d1fc…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 07:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 029d44eaeb2826fa8c3f89df908dc954 SHA-1: 66e15e80286a86f0a739b4c5eae2b8ae8f104749 SHA-256: 76a8962659b3d1fcd046bf615e4045a477cde8d857971c58b5b8335bea240e2d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ortopediaszombathely.hu/editor_up/82596115723.pdf In PDF document text
    • http://pension-erlkoenig.de/img/editor/file/riminibibadiwubagij.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/32107dfdf8796f6bd9ee1ee17bb89060/vikopenuvava.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/bojeluto.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/pilulo.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5i9j2d5i7jcge1jch1ur6p8viu/kafomebodunirixep.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/volazimavalogaziluwi.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608888c27114e---pasitop.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/givudapovusujuxu.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/61316c7e360d416c6fddd66943bae1d9/95516082678.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/90604170452.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/fa9c3103c1a266ca7d8ebf6fc598c00a/gevifomixanuni.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/laregil5e8lkabfrbr9u99jh8s/5521890233.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/d61ebe9c0208682e25ccd085d25a2df1/xurorotabelokaji.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/5da4b2d9c3533bf401f6d1eb6199e586/xapezemetunigegor.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082933034f83---10356370111.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/sekobotifazuruxavifavik.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/76440183180.pdfIn PDF document text
    • https://digireg.se/upload/topanofapupe.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02229b8ec---lulajulot.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/76097084566.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/gikojapoko.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/beloxepigaxow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=olive+garden+gluten+free+menu+pdfPDF 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_off0000df3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 10744 bytes
SHA-256: c541b39e0bb4285cc17151193fa4d46e743808af7cbf48ab4b1a54a2d70c498c
font_02_sfnt_off00010fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD6 18080 bytes
SHA-256: 1a52b4a326484e3bbdb27b9d7a77d105c46453a6fdd4331f7ef9e36164de7267

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