Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd2a864e2942bdf…

MALICIOUS

PDF

80.5 KB Created: 2021-06-15 13:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 06a562d899dedb3ca08dc0807249e121 SHA-1: 8ab12851cf91efc996cb87a55feaeb1b9bafe992 SHA-256: 4bd2a864e2942bdfe3f9ae028d5ae7129741b54a701ce658192fd146743568c2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document functions as a link farm, directing users to numerous external websites. Several of these links point to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier strongly indicates malicious intent, and the presence of multiple distinct hosts and UTM parameters points towards a coordinated effort to distribute potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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=how+to+block+site+on+chrome+android PDF link annotation
    • https://bawwabatrizq.com/userfiles/file/57756200746.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085c8db42155---20421114268.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3afb75ad75---dugarujelusodigaxivopika.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/fn8fb18kqnuhs2qhp96rdh3e40/44394998590.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/47368429083.pdfIn PDF document text
    • https://irantruck.ir/data/file/vixorenekenexurisidipa.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b34c47d6bd---70354439091.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d94ac4338d---95554928282.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/b70a958a05d83f073c4b3eaf9838ff03/10272628724.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ip5ul0qkieoisn8g8e3p6siivf/64721691204.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/leribelodoxadobaxonoviwat.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc2c3d1b64---nunasidaxaziv.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/g2gqqrlp8oilsqfnbakk05im2r/39575340333.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/17ktvtalntki1rrgaghn7uo2d1/luwokuwigavabod.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f7d515f70---40534234017.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/giqatbh22dhvs69ta0tr3jpvfmjp48mf/59458635625.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/27094176384.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/nun2lhvoksfj7mmk5t5q32svio/94269711508.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_off0000fb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 5436 bytes
SHA-256: 2845be7ffd3106a1e916064a5b4ab0d94708bec11772e6f6f0bd75ddd32bd8c2
font_01_sfnt_off00010df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF8 10908 bytes
SHA-256: bcfcf1f3fe8f3d34070eea5c608b46e85dacbb5bbd441978e486bd63831e6394