Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd8411a64434354…

MALICIOUS

PDF

87.0 KB Created: 2021-09-03 22:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6cd5a11cf91c6582171056e577c77025 SHA-1: 8e1a90652da5d27f8dd29d783ce889588dd30461 SHA-256: 6cd8411a6443435438fed052573b0d45b99d07fa72a55e3f17183373a20ad147
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://nomorecpapmachine.com/userfiles/files/mipalaginerafogujadaso.pdf In PDF document text
    • https://navliecky.net/userfiles/file/peluvalikagudus.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/74754763511.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/95195427245.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/wudopoteduxenopow.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/22784629526.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16086afef58440---65792206871.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/suruxatijima.pdfIn PDF document text
    • http://uci.ir/userfiles/file/41133097379.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/9472180296.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/91962143239.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100b90ea24aa---biwosalelebatax.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3a1c1ef42fad9cc4ea760fec2e5851eb/nidafikuwixo.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ldmk616ur6tiqdo5duh4ngei6f/12059869491.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9c23eaf40---wazele.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160840bd19f429---80023859175.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/56175869487.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2fe43b0c1c---79598511355.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee6872df53---75948881819.pdfIn PDF document text
    • http://goneviaggi.com/themes/userfiles//files/38717748997.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/bk10jdm3noth0af537tqnnr5o2/6301813652.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/resedazumizo.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/95528481314.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160881b181b10e---mebesidelas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=talend+open+studio+for+big+data+tutorial+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_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001036f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036F 18904 bytes
SHA-256: f7b2252f362ef987f8da68a9acd1948c25ec3a7c7d599208f049b9c5bdc6c7ff
font_02_sfnt_off00013510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13510 10876 bytes
SHA-256: e55a30741db33e2fc7cd84f5526efc732ec45783c1a37520a9d3e2ea03eadf3b