Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db71b01917cb6c9…

MALICIOUS

PDF

78.0 KB Created: 2021-08-16 08:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 44c265a545a2b7d5c09ee3e810b2d67a SHA-1: f631d2c26dfea7078375e3a66c54d21f2138369f SHA-256: 2db71b01917cb6c9cb86cc40cf8273ba4716182158eb78b0328abdefc89051f6
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 and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of these links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076de137bebb---46560920324.pdf In PDF document text
    • http://cristal-in.fr/userfiles/file/59726894181.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085946cbbbb8---wemusefopezer.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/57917280706.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/83359956216.pdfIn PDF document text
    • https://lesura.net/userfiles/file/kasixanojivosesivekij.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210511225427.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/pemagozekevevonov.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/45935071682.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160961c6f5bca3---84465776862.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160731b67eb161---dakojixo.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719f9b46cab---74561214050.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/l8qquj4ob77l3i43ds69t7smd2/91224655906.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/45244486680.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/af30549dc5cb88e16c67b52ccf42a238/59385071530.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/85718907783.pdfIn PDF document text
    • http://termocity.by/pics/files/73995567196.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/69336574205.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/771a5e7be76a5f9524f31e0cc0a67adb/gevogixumu.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210507120031.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/fa2a6581b534f98cc2b72683dcc6cc71/79271298912.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/dapeposuxuvi.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/86886259666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=tem+como+atualizar+o+tv+box+mxq+4kPDF 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_off0000c849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05B 19604 bytes
SHA-256: 6fbe098c8b74ba4897f8eb0494b556fa3054b3bb4199896b8fdbdcb09c70b062
font_02_sfnt_off00011040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11040 10868 bytes
SHA-256: c053e0201a1261747af73606ef43d604f22f5edb5f1ed304cf0e217e7594ef8d