Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1d933986e81b5d…

MALICIOUS

PDF

91.6 KB Created: 2021-07-20 19:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 79be11f1166999a827c289de25820d9e SHA-1: 0241150a4b6535aceed6841405f6c2074f315584 SHA-256: ff1d933986e81b5d30c7bff18b7c174091d7f5febfe591871f8e77269b2f2d8e
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates an attempt to leverage these sites for distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d75aa491f60d167b3002b12de45b51b3/17157997861.pdf In PDF document text
    • http://bygreenpure.com/userfiles/file/renepilogula.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/24438161259.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ras1s4oi58bdrfpdllu04mji8p/wuguwurezevip.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bdbebc898---sanekila.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/urasas7m5ntlu213k7fa5vb2ru/zofepigevose.pdfIn PDF document text
    • http://www.heksan.com.pl/file/48250703836.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/befefedofax.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ls3tgqt2clr6dvnhpgjb8cfhe2/75576802327.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/86985686864.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b050a3456a1---mepokunomebosubevilapi.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/676844230407e89fe4f3abbe525662b7/6231217556.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/63191381103.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/57d52949c123108e81f61460254e3ebc/16146227340.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/18665480638.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/xenesebimojifokosupaka.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083bcff8ba53---48219912655.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076c1549a60d---lapizuwiz.pdfIn PDF document text
    • https://foulardfotografando.it/file/38669598415.pdfIn PDF document text
    • http://bwc.lt/i/51514026069.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/72443573978.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f418c91d03e1eb3f5dc8f971a605cddd/foliwaguzima.pdfIn PDF document text
    • https://ibextrail.com/editor-images/87869355728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=happy+belated+birthday+wishes+for+coworkerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 16744 bytes
SHA-256: c2980926391e7b21be9bb7501d7b37260d99912ccdda6481a1fce587debf3914
font_01_sfnt_off000104d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D1 16212 bytes
SHA-256: 4d67f381172442398e38782bf826d937c9e4cb0b74a8bf4c6a2e6b555555b754
font_02_sfnt_off00012e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000146a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A7 11036 bytes
SHA-256: f4a5d79fbffdac282aa4b9c88344c6c86b4bcb3384b48949e42d396a6874e99a

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