Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a90fd8bc3c13942…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 11:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8784b2234eea50201a530f17c4c45f4b SHA-1: db488e1f8313b9b055e4431061d1c0a45b2ae896 SHA-256: 7a90fd8bc3c13942cae2cc54c85b494849c70f2d78804d9644e5e7f8e337e667
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to external URLs, some of which are hosted on compromised CMS platforms, suggesting an attempt to lure users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=how+to+disable+power+saving+mode+android PDF link annotation
    • https://novinfasteners.com/userfiles/file/22288283.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/25961284587.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/32145984370.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/hnv9hhai8468lbjg8j1nhmtchn/95790456023.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/egk0e9q3eukep0qmnctbet7acq/nonininanirutefotutore.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/42964157262.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b40506b39---35386536107.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613358f46b542---mobadofavilatakowaxonuv.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/nevujorogiz.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/16699019412.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/wodifexuwaluride.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/6361938353.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/xunufusabanos.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/zukirupopel.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/171837141805.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210909200251.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/xevususu.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/sujiga.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/woluxuwofofedijajebenijak.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/jadaxogedazuga.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/33616138090.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/82295364327.pdfIn PDF document text
    • https://path.mn/userfiles/files/mudiwenevodeko.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_off0000e704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 11016 bytes
SHA-256: 5dcb6faab6cbd857826fc4ca684f1a9743ea48ea6f8fd576e26af4884b039a31
font_01_sfnt_off00010031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11843 17144 bytes
SHA-256: e3ca800ccd372fd2d8e9ae2a4162bd3fcebbb05b1e06c9a347a0a563508d1a52

Open this report in the interactive analyzer, or submit your own file for analysis.