Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc636e7925b46944…

MALICIOUS

PDF

86.1 KB Created: 2021-06-25 22:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94d7ea0fb29c8934a285ae73abc309d3 SHA-1: 2520d185b95d82ec21aee871d6252e9bcc05b818 SHA-256: fc636e7925b4694411616b5a56b7e54ae4b0bfc2a6db0a02c96e4d720fa353ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the heuristic firings suggest the PDF's structure is designed to facilitate redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=old+film+texture
    • http://mikailang.net/userfiles/file/20210501162150_1069027859.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d5b1c16cc---sidamosawaxabiposorox.pdf
    • http://mobydick-band.de/fckdata/file/38565719019.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad57eb1cc8---kawuvamevamuluwuvari.pdf
    • https://diarch.in/WYSIWYGImage/file/nefudu.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863bd3050fe---nemipazigosodoroju.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c31d4bd596d---larimugopuwuludujubovo.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/498a3f2ef1327cfebd45a0dd751484cf/liladupubuponerurufiba.pdf
    • https://camping-du-lac-dijon.com/fichiers/lidujeresodome.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/3c145a0dd6ab25d3f193d3d94e8e8c25/mapazamebum.pdf
    • http://indecomavo.pl/inc/sasusarepapovamovuj.pdf
    • http://sinhorelli.com/userfiles/file/19807903640.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/21f9cd86c50c7e8aa478efd2805e3cfa/76472908028.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/mk6djppf264es55421l274f504/33112255072.pdf
    • https://drvishweshwari.in/userfiles/file/popasiledulumanuriras.pdf
    • https://systematix.pl/userfiles/file/rajedi.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7cb4271f1---jifexazebubidog.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/69a2d98548cd456ad26bb7f4f1cf3d18/vojiraxefututesun.pdf
    • http://come2menorca.com/images/file/jopulupofexa.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078254287494---poramerafavur.pdf
    • http://matchedtubes.de/userfiles/file/1134386250.pdf
    • http://daotaonhaccong.com/uploads/userfiles/file/kuzototo.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ccdae48d6---mifis.pdf
    • https://cplastik.cz/data/cms/file/53026328536.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eefc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 16792 bytes
font_01_sfnt_off00010713.bin
d7e0ec3b27cefa954b069698c09923b331a3595707cfc3e979f68aa896a85921
pdf-font-stream PDF embedded font (sfnt) at offset 0x10713 10188 bytes
font_02_sfnt_off00011de0.bin
45efdc9809a699d4c41cfea35381295f8fad6632048e27f19fe4e698289dce79
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE0 17452 bytes