Malicious PDF — malware analysis report

Static analysis result for SHA-256 3800de833ebcf79e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 14:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 25fa7220fb81fc7d7f53153b3f697164 SHA-1: e83c145f00ed19d7f5290bccdcc241b8d464c5d9 SHA-256: 3800de833ebcf79e213b8c2e27a16e8a8a0d0815c0198d355d1cc85192671c6c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' in one of the URLs indicates an attempt at tracking user engagement with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://nomylo.ru/uplcv?utm_term=entry+level+operations+manager+cover+letter PDF link annotation
    • http://rjt1.org/upload/files/25419084847.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/19742869944.pdfIn PDF document text
    • http://iltorg.ru/upload/file/81298318134.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/xalewejegoxudapiwagut.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a651a5c817---41400893983.pdfIn PDF document text
    • https://argumentua.com/i/file/20796764646.pdfIn PDF document text
    • https://ksboutlet.com/file/files/pejiponizurufazopuseruj.pdfIn PDF document text
    • https://coluer.ir/documents/file/vorunu.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/65478766865.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bedcd16bdda---milobilipetek.pdfIn PDF document text
    • http://takeacode.com/user/d41d8cd98f00b204e9800998ecf8427e/file/33980915891.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942d8fb828a---megobidizomusijitepexoro.pdfIn PDF document text
    • http://mientrungpetrohotel.com/users/files/tipow.pdfIn PDF document text
    • https://birotex.rs/images/files/85124760443.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/df715e3ca9024f2f39a314b3b197bc6e/gupir.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/r2hds7bk47iit8hu6q4vat4e63/mumovet.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a424dbeb02---sojezudowowebugenexipebin.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/fitiruvugi.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86697da9fb---vazogadanipeborolire.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071841ab16d8---29797924295.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/24123609764.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/sarupobimoso.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/35076855541.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608747fd75afe---81730809809.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/29496652151.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/dcbvfseq9l6mgcmt9omaod73c7/niwolanemunonasonomezinod.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/47856271609.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_off0000d9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 17228 bytes
SHA-256: c17330cbee628c0d0b87320edff4341fdda90ae2b84c98ed221e5c41530d4537
font_01_sfnt_off00010631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10631 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E48 10880 bytes
SHA-256: 8370990f862d17335e2e1afc3755b27ae5f179a60820c65be531226676d1e299

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