Malicious PDF — malware analysis report

Static analysis result for SHA-256 713716f078bb336a…

MALICIOUS

PDF

83.5 KB Created: 2021-08-19 17:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d52888b92ebd0073763abec6f641996c SHA-1: 81cfc0290333b69b340fc530dc2e0484b16a9a49 SHA-256: 713716f078bb336a8bcc47560ae11d86090a212d51acd7395372ff2f2dcd381d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs and is described as a link farm, with many links pointing to compromised WordPress upload storage and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cructi.ru/uplcv?utm_term=descargar+super+smash+bros+ultimate PDF link annotation
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/ropefotoniw.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/2eaadd36f66e73e67a6b6ae16a6372e4/kirijaz.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/60289176282.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/galoxadejefazaz.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/kokebed.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797fe78c03d---6267239101.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/46842696816.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/katuveromufeteni.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/nar3ckqqm8l1vsihcsnblsmpae/gixibuvefidudibakelilugak.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/nuwimijujibabavatofebakuz.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/it7b3l2nl8kc5u6e4umatcpto1/70984612173.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/jjtnusmsp6v4pv9lh6noc79m0q/somugedopoxafal.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/60913019624.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/lesuremufenotiwixax.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1d6b3e113---71643120225.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cac59e30363---80410374398.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/50a2235082ca4e31fc1cc2603cd28d89/18902428433.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/3ff9ca697d03b99b174a356eb5244007/9632340677.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/33558486263.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/j4aegba0fg6tf4hp30t8s10up1/81850583871.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/dc9ba2f19203e8fc6e28fa328d313904/39916224527.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/gijadudineruwim.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/18808947437.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_off0000e01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 18224 bytes
SHA-256: 2d5fa7e1086d68da5d59fcf9f7e35af32e98f21a1ed9534dedbece6b511826b7
font_02_sfnt_off0001264a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264A 10960 bytes
SHA-256: 69785e23cadc7d30b76be00283d7870ab972209deba8c5ac8cda544c8b802e21