Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d695360af75d9f…

MALICIOUS

PDF

68.7 KB Created: 2021-10-04 05:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8bd300d59235dec3b8d45fd63918cfae SHA-1: b89e7a536942ea6bdba0a051e59382778cfd1d5a SHA-256: 83d695360af75d9fcfa0364694571e385c3f72556322ed3e704810e4472c0bb3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with several heuristics indicating a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://tbeaindia.com/userfiles/file/mazutopiwodebabimo.pdf In PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161497f6406424---mexiwazojekufilugasadit.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/33037099818.pdfIn PDF document text
    • http://chanassociation.org/uploads/file/bedapadafumufekasisa.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/vuzofone.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/9341354378.pdfIn PDF document text
    • http://chapelguild.com/images/usr/71219076728.pdfIn PDF document text
    • http://crediramasrl.it/public/file/41202999015.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/ef8a98660d5fff26461906fafe0f0f3f/33535485212.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109181849016629.pdfIn PDF document text
    • https://cardolf.ro/files/21614116978.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/bcb56de55a3dcda8a1c4929506159461/60542270825.pdfIn PDF document text
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/kagowefadevolavos.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/18527398617.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/turelarudofevepatux.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/wivaxigopepetifejavadog.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/73977695423.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/96311701228.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/71514675178.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/tizojarukajivexot.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/34299195317.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20211002161050.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/nibadajojufa.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/63472014970.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/kariselet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=blood+type+a+positive+food+list+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_off0000b153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB153 14336 bytes
SHA-256: cd35fe02693cbc222b49c838597bf190d370da63577930c81f7ccf11fcb8527b
font_01_sfnt_off0000d51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 10520 bytes
SHA-256: 5505470afb6f5c11b1c661af93131fdc780adda5886ac7b4b4b49cfff1a2edeb