Malicious PDF — malware analysis report

Static analysis result for SHA-256 a263ca910b7f9729…

MALICIOUS

PDF

138.1 KB Created: 2021-07-08 09:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: d427a95ccd22878327d769ebff1fe100 SHA-1: 503818d62a5d5a66089e6f4c13a7ccd0c110cdb0 SHA-256: a263ca910b7f97299595c9a500771ca38ee767fad81792e8884ff558ef93f17d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to potentially harmful sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://coretry.ru/uplcv?utm_term=bayer%27s+process+of+extraction+of+aluminium PDF link annotation
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d5303983f---wenikuto.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd366a2f16e---72806129473.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075a28006d13---28625118715.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cb12f24b6---37810203316.pdfIn PDF document text
    • http://dzbnf.com/upload/file///pagixoxizav.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5215295632c6f04e537fc136230b9611/gififozi.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/6ec8effb0c96f22927d0207ba32b6bdf/samudize.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/eccb001adc7a0001c6bd12ee2744699a/bevilijofubevide.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/galukeve.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160bec4c6733c5---83080476824.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/gh4spbijb60ojc6rqnuieo83b2/roluxodo.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6bf67e3d1acd6ce52dd053bd9d46e559/99870835204.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8fckg4bnt0n98o6hbhfebq4pc2/84616397791.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a12eb8259f---fufososowufabopudoposub.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/caacff5840fe968cd322f41db8163acc/49127978101.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ub4688449fhkdkvt2d3nt9coeo/61367321328.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/91903768530.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b07144fe1---72075756231.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ef318d937---tagazobowurupewosaguwixol.pdfIn PDF document text
    • http://tierrettung-in-katalonien.org/ckfinder/userfiles/files/negewibebenopomugawiwubif.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/47398236551.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/43013644050.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/wirotelizexapabametutoza.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160786112da675---57090042888.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/72144291504.pdfIn PDF document text
    • http://xsteelstock.com/d/files/jujafexewiwifubalebofe.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_off0001b027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C83E 11044 bytes
SHA-256: da818fc1b27b67ec3c08e0d93a915077c79d8a1560fdd49ebdcac977c556970a
font_02_sfnt_off0001e208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E208 21556 bytes
SHA-256: cacc9cda60155c846bc319dcc0b2a4aa2e28dcb5ae2fa8dbcf2856147beb0f77