Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28e700a0bb52b13…

MALICIOUS

PDF

75.0 KB Created: 2021-06-09 22:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b11890c4e2059c1fd83a7c721e235584 SHA-1: 414c580040d64a320d6ad5a65663398a0d6ff583 SHA-256: a28e700a0bb52b13f702fb12503e7bc0166931cc599d0f095017c46b4a9ed440
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or credential harvesting campaign. The embedded content, though heavily obfuscated, appears to be part of a lure to direct users to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://irlanc.ru/uplcv?utm_term=class+11+redox+reaction+notes+pdf PDF link annotation
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160946503a0cd5---84823421364.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/euqevt4g71hn382r182bpf2ga8/34003624271.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/cj98jplnk1ijqehfpqll6tn105/jamuxiruwozajamejo.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607544589be00---narubodukobudebi.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739aecccc25---nitenawuzufav.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a25abe3378dc588bffdcfb923ea87179/kuravovefapuwejixukababow.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/29fa49ee67570134528cceef07083e80/xevovetorakitetisusowujo.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/dbaf7bbec9ed07274c6c093392337c74/toserifetalalivubuligun.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/s6400ef6ng6buv7ia9d4lllauf/mipewajalilenupugatu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d2437d06652f4dfbd70ee7ea177c3e85/tamonixul.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2c5757ed1---pifazezekugiresawopumavu.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/nixusokemoda.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/d68305e4fce76eefa59b7ce5ab595133/kodonibepepagafibalarag.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160738d15a35be---95711302888.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811fc99bf51---80908199689.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb5c67718---vipizofezabubolinuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76C 5172 bytes
SHA-256: 80b6fff36de5fc43a0ddefe2ce414b2ebe821ce7a3c32aae81fbbb6a6c508dc5
font_01_sfnt_off0000f91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91C 10656 bytes
SHA-256: 158352ef9e306c551dca5e7c68b13ca31eacdae8412a0a384e7ae15efd05f542