Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d82cf977e583594…

MALICIOUS

PDF

110.8 KB Created: 2021-07-01 19:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 391301b8f167eefa9652698e17177fad SHA-1: 8ee72f661984afb07b867cf2a5a9f2c10e63952a SHA-256: 9d82cf977e5835943ebee7ba34e8d5c8af90546a7b855298b1e5447bb93a63b7
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, rather than user-facing text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=the+difference+between+c3+c4+and+cam+plants PDF link annotation
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089753375946---74018386450.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/46988943024.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7186c5529---wusiwazotunokutajo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9549b47c---duruxamaramadik.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608095509e5cd---jupejalili.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/fitazaruwajanipivapak.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/zumexozi.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/855c60ebcefc16d4c9749afae6e7a5b7/91049313553.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b204545aa50---lisugif.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/5891ed83b61e6f7e917a47cc98a7e0d6/30780041231.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/1adfea864680a603184df2ea3e92de90/99141097047.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/32978960744.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608881598ec5e---favogida.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/b9247bdfc9c10d641844bde1b119b42a/nixamuloxajujapenepuxe.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/58580900209.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/kabewawemumotosaladi.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608efe555e97f---43518062560.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f5db704a3d3860ecd99984b39d2be86b/bibubiwinuserupigolug.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/63444600076.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/kilulevutixe.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/jusuvakupoxesixulasaxok.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/kugefi.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/a8c0dfc81248b3939a3404668b23f4d2/63175485489.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_off00014c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16426 18096 bytes
SHA-256: 67e7a463dae90b502ab7da81405cc873aa391d0022eb3d123a63ad5d52a021c6
font_02_sfnt_off000193d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193D0 11204 bytes
SHA-256: d4464ec8cd9a700af1a0a9d699ed088a6fb414b20ee9455cc464d57240a3f42c

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