Malicious PDF — malware analysis report

Static analysis result for SHA-256 c768bc2b24087c14…

MALICIOUS

PDF

79.4 KB Created: 2021-09-19 19:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85efa1606e718c8867b5507d75b0d6d8 SHA-1: 299324e965f9bb6255b284d7172a0f125b0d5f98 SHA-256: c768bc2b24087c14568ca1075eb10c801323ce5da4c1065c3c27cbfc6da91908
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://autohausnschmidt.de/userfiles/file/polipunopuzununurivabo.pdf In PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614072f9609ab---sazadedepenegu.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/46977550370.pdfIn PDF document text
    • http://aven.su/userfiles/file/vibowexunolup.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/o6j5c18o1nigaufib3um0sljfa/lemijilofokop.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/wafuponolujanijadi.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/7b7d95d98eeea30817cf7b38c3a7a896/xafofibalubepegagebefip.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/navamejakarirem.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/85189628189.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/xemizovapufedorarir.pdfIn PDF document text
    • http://hrudolf.com/userfiles/bijasitemasumutokugoxep.pdfIn PDF document text
    • http://airsoft1.ro/files/file/97323955397.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/wikoridosotetokolimobe.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d7b1b42cd8500cac80a71be80af252c8/fuwoziteruwane.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/luxixebam.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/xuwulil.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/71174b34def359a644c4725fd2a31143/44527731114.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/36829865560.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/7414788364.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/8811893103.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/dajizasaboj.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/31882115058.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/kotisajowuda.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399a79d358a---77246960760.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/kazebojanesela.pdfIn PDF document text
    • http://intersonik.eu/upload/files/wularapob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+three+brothers+in+harry+potterPDF 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_off0000d41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41D 10520 bytes
SHA-256: 2f0c113997a46c4a92de46c6a44be2b2ba368c8160e17efdf6e9e0afd92be813
font_01_sfnt_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 17160 bytes
SHA-256: 98c95447186d417d05cfffde44dc02d70853d331c6398bc44c1d77417db5b343
font_02_sfnt_off000117eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1