Malicious PDF — malware analysis report

Static analysis result for SHA-256 6623fd7ef4d5aa7d…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 08:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 26ffbe060374ba7722d2f232010b4e3f SHA-1: b896aab00c6c42f7e8c0f9af370024c7fcee2808 SHA-256: 6623fd7ef4d5aa7da0f922dae01a98f3637b3320585013a7ec75942a9c333e4c
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm, suggesting it is designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but containing embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://coretry.ru/uplcv?utm_term=science+worksheets+for+grade+4+icse PDF link annotation
    • http://geologocarmignani.com/userfiles/files/gubadajebivagosava.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161208cdeab94b---kumifij.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9fd58cb754---xexegaxavarudigenotewexo.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf7057f4a---zegumisade.pdfIn PDF document text
    • http://beta-rc.com/upload/files/99651371243.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607355192bc6d---rabivudodoxumerozedep.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d893ffb79210b98cc9695ca0809fcf51/93046022057.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/17686723129.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/12554369514.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e7a280927---98739270232.pdfIn PDF document text
    • http://xenangheli.vn/public/files/xuwanifisoxibenoraxa.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/df376d06d2d0fec2f3ccedd392bbd905/kijekuziregitilib.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608325939c0ba---xubosorajorulapuvuwute.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/8304921130.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920d47f391e---diwofanufibubo.pdfIn PDF document text
    • http://internationalbeautypageants.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/sofawedilomajusav.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/gupuga.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210624_053618.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608114d9b7e93---95306964716.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/44b558f5fa88c07783804f73b8c1f3be/93701420090.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_off0000c3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 11040 bytes
SHA-256: 8c0604ba379a03202cd4060449198ecf975fd466b836e5ce0cfd1852632cf583
font_02_sfnt_off0000f553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF553 16260 bytes
SHA-256: 496043fd1f2c756b022b1c1dd0e5ae66f263941a310d47cfbbefe8e66ace39fd

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