Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd77fd36baba8913…

MALICIOUS

PDF

187.4 KB Created: 2021-06-24 23:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b2922b77e8b0359353c6e243342bf00b SHA-1: ab20ef113a3b167b73dc85cc065d6b8b6d964be8 SHA-256: bd77fd36baba8913e7b9e1a2e0901ad1717bc90b27e6bf4e39df9c8b35b7d6bb
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the overall structure indicate an attempt to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=ds+craft+download PDF link annotation
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607158e70ba12---88876033480.pdfIn PDF document text
    • https://bio86.net/fichiers/sabofilofonevenam.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/a43v1tup0uq2es5io83hjckvj3/xebijegipulepasumas.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/18003893004.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2ba831b5f---galavudi.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e4a580dc3fa166660e4c2dee431e511b/64073204558.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/53920139206.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/80943478999.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb567c3efa---riwujoro.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/9754665342.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/736248213e79c3ca504b86be7f5c4527/44315356473.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf252b525b---buguvexuxubazonesuroxo.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/4895593e92fa41c9d5dc1b3b963b1373/situve.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/d4f20e9aecbe26180a8b599c8c5fedde/73437324203.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/53v6kpt30n0n8in5vktsnv8g80/93068615683.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002595d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2595D 15172 bytes
SHA-256: 98831f14ab5c9dbafff6e70c691e993b657fd4a46da4242de0dc4757d59cb74f
font_01_sfnt_off00028b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28B3B 5108 bytes
SHA-256: 08879a8983c5fb34b226f793c10a0e57b4b9362b53bee0613cc4ed5ae780daad
font_02_sfnt_off00029cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29CC2 13952 bytes
SHA-256: c8962a4236e5e9a513db1dc60fd44455699169eb2ab94381e9ca8bbb481a36d4
font_03_sfnt_off0002caa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CAA0 16112 bytes
SHA-256: da133098c8ec00180ce5fe37c74b807b143adc5860869a2f7b6211e455203b10