Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c53e5895c01c91…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 21:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f2b5dd35544c9fbc226f4c32cd7c5c21 SHA-1: 4ce9a3212f8e80bf3ede777c4ea82985427b411c SHA-256: f5c53e5895c01c91910f99b21bfeb7b412d8a8058f0ecee9dc065c4817fb6588
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, some of which appear to be compromised upload directories, suggesting an attempt to obscure the final destination or leverage existing vulnerabilities. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://happyorderfood.com/uploads/files/34428759152.pdf In PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/tupuxaxan.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/lixuwava.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/69816866974.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/fudafeselesewonorolakap.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/48512374241.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/93500754864.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/62155778017.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/47817335263.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161304f5f0f74d---34522971366.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/pariwubuzugavuse.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/20797465654.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/8287920632.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141c65246a55---7845417837.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/78212141097.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/sumunilo.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/bimok.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2bb727fdf---wixipugireluz.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/23953738275.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/10391300633.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/11170713379.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe82407b4---10804062924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+fix+sound+problem+in+android+phonePDF 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_off0000de8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8A 18228 bytes
SHA-256: 1779fe095839cb1bfc43945b83312ce51111e20ae832f85bb61a5a4261a77567
font_01_sfnt_off00010d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D80 11180 bytes
SHA-256: c753732cdbb0420128e703b162fa0fd6803db27c31d0fa8e236307f59df11019
font_02_sfnt_off00012740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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