Malicious PDF — malware analysis report

Static analysis result for SHA-256 de16314b29467cca…

MALICIOUS

PDF

89.0 KB Created: 2021-07-08 03:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 272347b56db31480d3fa2815114e14a3 SHA-1: 97dde210d79b0f58c84c4aee552a3e08592e9818 SHA-256: de16314b29467cca0dbfacd1634b238bd58050d2f936a4cb7db3320c4aba73ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://irlanc.ru/uplcv?utm_term=their+eyes+were+watching+god+nature+quotes PDF link annotation
    • http://kingcraftviet.com/uploads/ckfinder/files/jifavuxapowejavire.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/minimeniji.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071108458a7f---40201609579.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/60177712536.pdfIn PDF document text
    • https://ebooksweb.net/files/file/nirorufu.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/7234491950.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5cf9aee13---sakerexebo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa7a6a723c---jimavapabidudamufexakamo.pdfIn PDF document text
    • http://aurora-c.jp/files/files/65906593974.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/15377339520.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16074a3d525650---99715114098.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/027a5d90ae7bd1fe5748503af9114244/xikigugofojanigiba.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16070c404cff73---wanekepiboderak.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/63832558630.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/rewaxibuzimuboga.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/3b35d48e2217ac27d13c1c04f8c1a72a/14297530518.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/64d61b712372f76833066f8d779140df/boxisojilufejebabupodogen.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba16448795---timeminoveri.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/fezurezunepilerewafugu.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/6774254ed7f9f17d65dd669f27ae3f66/75007025238.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ac77vno6o0trtc4tfef6ct8dc1/berepidararewev.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/qu3aijb52b4u93iqf08s61o73t/45054220555.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb6f886a62---90933180694.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ba66879805032cb4167fb7533e97d91d/29344648118.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/69239504302.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_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 11012 bytes
SHA-256: 53a543fe1853ed0a0a44149e1ff569e065b06b21d1d177fa7af261930659af6f
font_01_sfnt_off00011361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11361 16888 bytes
SHA-256: 3d43e2162cfac2f34bf34a449a2eb3417af11a098f0b96ce6530f729b35ad251
font_02_sfnt_off00013e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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