Malicious PDF — malware analysis report

Static analysis result for SHA-256 8adc956cc6bd9fae…

MALICIOUS

PDF

86.1 KB Created: 2021-09-11 07:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d6e51df706b3e8bb45d46c48308cb470 SHA-1: a403724dc95888e8132405afb73bdfb34eee8107 SHA-256: 8adc956cc6bd9fae093b27ab9896b54ba57b3e41b2c1cea760ccd5493cd519ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm. The embedded JavaScript likely facilitates malicious actions, such as downloading further payloads or redirecting the user. The link farm points to multiple distinct hosts, some of which appear to be compromised CMS uploads, suggesting an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=five+basic+guitar+chords PDF link annotation
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/89bac1c421e76b32400821cf51b30a1f/20887063994.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161369d0406b72---78652179001.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/vemiramafozozi.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/1612969109.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/81521799653.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/bukafamixo.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/86311268564.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/pifemivir.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/guzizezisugi.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613292c90efc2---86652991322.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/95899853139.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/51734659052.pdfIn PDF document text
    • http://synergyproperty.com/images/files/59880348681.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/25991160055.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/5rnijvscgolfegmneq9sq1s4q9/69581241403.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/nidumukem.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/86089746159.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/kajolexe.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/kutul.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/lexigozasazejolakemol.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/3f67369dd819e59aa93d520369afed53/52946095859.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/9972499880.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/degefexunurun.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a07e7f5e9d66731d39ba9afecf3ddd4a/31072246690.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/koraguwarufotamo.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/lulatibonexopo.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_off0000eafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 17800 bytes
SHA-256: 2eea8ee0cbef17aa5dba2e09e48df283331b88923288e7586ddbd92cfe28666e
font_01_sfnt_off00011951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11951 10780 bytes
SHA-256: d3bf16882c91d80bfd396c9df9d7a92691b044dbe3cd61cab5f3525202163d81
font_02_sfnt_off00013224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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