Malicious PDF — malware analysis report

Static analysis result for SHA-256 c481fe64d677859c…

MALICIOUS

PDF

77.6 KB Created: 2021-09-11 01:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 285041c5c0d2dde25ddbdb4db3b03ccc SHA-1: f9c31422ca20b8b84a045d72dcb8009d459dac4e SHA-256: c481fe64d677859c68dcb1383b9c23b832bd307aae7bd189537ea1ccd1bc641c
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The primary function appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://safetypadlocks.eu/eurostyl/photos/file/85340278683.pdf In PDF document text
    • http://jcnjl.com/userfiles/files/70076739601.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/polekeduvo.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/83981916507.pdfIn PDF document text
    • http://stylekd.ru/files/jopakuwin.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/vozirewar.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316c87827c9---2344445891.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/9d023f1df309264ae70bd6de2b1ea2e3/19927205865.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xubobokikugiwopiw.pdfIn PDF document text
    • http://spiregene.com/image/files/20210907_153731.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/rn4etsgh5j66hlgs7rmeei1bv9/49222391208.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613662dd9628d---72790557151.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/dtjacnos0no44vq9iv5u29f8hv/zigenun.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/54929441849.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a93be9f766---salipafeditarafew.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/xogofitawudewujalopovelam.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/lelexugimipog.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/18495989166.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/nenaxejinupoxubava.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/jutofagatugevuwiworoze.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/73001338699.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/fizonenizi.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/kanavisabenezonajelonufow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=microsoft+exchange+on+androidPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/tefelativaromo.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_off0000ca84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA84 17632 bytes
SHA-256: 06b0dada78044a7165b15f8fda9001961433f8cc20444230fcbbcb6068a1f55c
font_01_sfnt_off0000f817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001102e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102E 10804 bytes
SHA-256: 8d99661b159a56fea3ae65ce836265f80ec9c2b2a2525535766f4c68b66a43d6