Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b0d757982ece57…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 17:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ed3bf61e5297f2d5f1b31acc4ad91e7 SHA-1: c110e4b43ffa49c81a9e926102f60066533c38c7 SHA-256: 40b0d757982ece57f92190496b4f3a9c8225d78d8145de1746061ad9b7db48d8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous unknown URLs indicates a broad distribution effort, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://paramountswimwear.com/userfiles/files/nuzitewimodudilozexipexol.pdf In PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6ddc5805---mubosisefuxa.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/56667966643.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f02774223---55751388125.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/mugakujufiwakuno.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/zajovujobajevirulatoxab.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3bc7435345abdea16b078d9aaf3bd217/pimiresa.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/dubasuwami.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22f695098c---47442322438.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916eb2e44d8---91778378791.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/82487942298.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gv8bbijp1ij9jpvspooj1fba46/tasavowoxedezuz.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/872c0867d934209400ce48193278443e/nivelasafewamiwumanavew.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/83160905168.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/98437627805.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8749a4e17b95c4c73e081d02cd71f061/8885055799.pdfIn PDF document text
    • http://sooclose.eu/upload/File/98684287674.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/80859951990.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160760f1537b73---99840020166.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/mafijipasumobivemuvar.pdfIn PDF document text
    • http://temple.mo/userfiles/file/fuzijepalule.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/kesifekexikarap.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/xokukukidobifozitedofa.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160749fa2dac6a---73997417594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+manually+update+intel+graphics+drivers+windows+10PDF 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_off0000d5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AA 11492 bytes
SHA-256: aaddaab24727cbe509409648bb0e6708684524d68bf57f261cfcab3c8e2125b6
font_01_sfnt_off0000f084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 16564 bytes
SHA-256: a5003067058ee97b9510abcf340b549d3eda0a4b6f19fc58175abf956bf61027
font_02_sfnt_off00011b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1