Malicious PDF — malware analysis report

Static analysis result for SHA-256 9546ec243c608aba…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 03:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 458dd6aa9a960e39a60cc0098db3c3f6 SHA-1: eed3a02abbb88d11e4d6e4ca4a1d9718439e986e SHA-256: 9546ec243c608aba971665aa2c90121539d160b8aedacf8e87e1852f317410c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which are associated with compromised CMS uploads or disposable hosting. This pattern is commonly used for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://philabc.ru/uplcv?utm_term=libopencl+so+android PDF link annotation
    • https://sfeerweter.nl/userfiles/files/nelokupigerokone.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/xibagexufosef.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614e6406bdca9---50586367810.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/764b8971325dfc8d173259c6c776a448/64008178737.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/pamag.pdfIn PDF document text
    • https://terracell.info/images/file/43855486143.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/rasirodejejagulurirof.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/88873286725.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-19/20210919141525329519.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/95498366463.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/50463942482.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/38945513680.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/meburo.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/jugibomepexuxuke.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d7c6ad981---87819115628.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/jokipifasegon.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/xisadek.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614539c620b43---gozamapegogadof.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/34303462646.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/24714285000.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/tigomiretevekuxor.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_off0000af1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1B 15260 bytes
SHA-256: ae237f417d9ae50e9991c788e56f2cb0754ab5145d6f79938c21c0b55f847a2e
font_01_sfnt_off0000d577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD577 10504 bytes
SHA-256: 30df39aa40e0761e78cbdea1de244cfb6ddf71017b97e59585eb368014c5a3b8
font_02_sfnt_off0000ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1