Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d657ad1ce8c771…

MALICIOUS

PDF

99.5 KB Created: 2021-07-05 22:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c80dd53dc8464baa5b5c8733de5c7e9 SHA-1: 707d0b2010ec24d9bef5bb943f2f5f2617a4505e SHA-256: 12d657ad1ce8c771f93824100cb6ed2591c64ec9546a36f1e1d79bb61ce0eed5
96 Risk Score

Malware Insights

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

This PDF file contains a link farm, with numerous URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially malicious content suggests an attempt to redirect users to harmful sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or content-luring campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 5

  • 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://nutranghongngoc.com/media/ftp/file/jikexuzubudasas.pdf In PDF document text
    • https://fivetc.vn/uploads/files/21552357719.pdfIn PDF document text
    • https://pindimana.in/uploads/file/56950908866.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/62641532400.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9796e9c58---febupifu.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/c87849f279a0470bd02476ef7fad25de/lefowabamoserobatap.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/puxemimiwusapat.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/teziz.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/69s8808ttv1dtvh70pjlrn86bt/kivivop.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076efe29699f---somewidulawawiwepibi.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27592d41e---75121410884.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a94fd6fd2---15446485530.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f33c78bce---pagajadepamegobo.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/sipenowugusi.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4510ceb663---lonodixomap.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/65601374626.pdfIn PDF document text
    • http://emannsltd.com/userfiles/24579748920.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66ceeacd6b---dikoxop.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/adbbea5fa9665d6b715156eb97d57df4/145030904.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/xafefob.pdfIn PDF document text
    • http://cke.hk/userfiles/87914865590.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731698c7c6a---mekelurolewupaba.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081efaaf134c---jafeneguwirefagogon.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160805d77b3405---32349178328.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f503401ac1---29253424555.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/45405175636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=collins+english+grammar+and+composition+class+4+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_off000118f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F6 19348 bytes
SHA-256: d5f18714ba3a47bb8f7c1b7fa3f4d0f8c1607275ae26e19224e924156f25ee9a
font_01_sfnt_off00014c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C39 11176 bytes
SHA-256: 89540ee84e5e19da0b32ff36c1ee80d0745e23da034d7c5cc7773c456e7e95a3
font_02_sfnt_off00016607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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