Malicious PDF — malware analysis report

Static analysis result for SHA-256 85361d72123becea…

MALICIOUS

PDF

94.5 KB Created: 2021-07-25 11:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 205e6ffc6fa43a8439602ad5e0d20e88 SHA-1: fb2b2e2a43c24b70316fa8583d77d3413ba9d499 SHA-256: 85361d72123becea8d554032152712e37d9e25b9c1a7e0db5f2cbc24c7b1089b
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues to its purpose beyond its structure as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://consultingexpert.eu/fckeditor/userfiles/file/tazupowuki.pdf In PDF document text
    • https://cortemadera.com/wysiwygfiles/file/nesenabaviwu.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/18/file/20210518_061915_186.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ac22d4cf4d8---15897549226.pdfIn PDF document text
    • https://thietbiytedaibao.com/media/files/repufujudofafatiw.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06ab3adcfe---jalag.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a4a0ef3b40d0178de7fe01dd832f019b/66809635306.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/1290654126.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607218532e3af---83985470892.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160933a1397a78---wupafeseletozefalexij.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/39fa50c824be7551d3dde6d1af6755d6/51213256122.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/40717eee5a594a34aa491f0a86b181ab/sokim.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f834beb7c7---xinete.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788a8930f60---zemuvasumeg.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/kkbiaglmaedjqrg8knpqqcsu34/37838424729.pdfIn PDF document text
    • http://ropesadventure.com/d/files/40340012310.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/47726250991.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/67273006610.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/51183373250.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/71297681818.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dd2a483d1---removebap.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a262da0d9---rapisuzefujekefe.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/25s0eiv5f10l0uhrteck98b1f0/vuxoxitenabonulawutipu.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/t4ss2u2265d487rhpo11goq8kl/mokuzojoxepisadesevumew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=significado+de+sentido+literario+y+figuradoPDF 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_off0001015a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015A 21600 bytes
SHA-256: d8339705a7bfce35f61092e28f0619abef8d81782b3cbc590e842daab8c14156
font_01_sfnt_off0001386e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386E 10940 bytes
SHA-256: 802b4ce40bf3662d929c58055b3e48deecef1d5515adadbb359232d8d8619128
font_02_sfnt_off000151c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.