Malicious PDF — malware analysis report

Static analysis result for SHA-256 041b0f95056fdb6b…

MALICIOUS

PDF

88.6 KB Created: 2021-09-03 19:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3cfc69a8235418362868c341dbd0c46b SHA-1: d11023d674aeb268fa7d1f3ff8df3d0423149ea1 SHA-256: 041b0f95056fdb6b3d6bf546973c8f55e375792fe5e4abaefedc7e6e815ac2c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/d890d3bbe73406fa294e0d5e7b370029/zifasemimizujufutunalix.pdf In PDF document text
    • http://fsoa.cn/userfiles/file/80577373327.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78674943074.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/35957403604.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610564190f26e---gosanoz.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fda20d7197---56642067983.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/51736942998.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/gujusigiketalog.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/74794635058.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/vavilo.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/24466301456.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160780bace51a3---34379163904.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/zibufute.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/xogerafaxila.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/wojawana.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/buveb.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161219720c4e18---36478247929.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/pifejabope.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/49e8333f17851215e8e2eb806f1e1a6a/goxurezonurisirogonasuwow.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/91179687811.pdfIn PDF document text
    • https://computerzone.pk/file/96515670899.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/vijar.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0c3254fe5ee91623dd1970f2f2ed3e7a/56428471424.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160817a696e824---xefumadumuza.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/4056476143.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/48388433548.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/68043717168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=splitting+pdf+files+in+adobe+readerPDF 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_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 18460 bytes
SHA-256: 8419b37770874412ccef2826a33c3f4656e03a4a56b87aebfe3a05cd57958828
font_01_sfnt_off00012351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B68 10888 bytes
SHA-256: dd582b86f29035639cfa20d7242590ae810efcce35fc749cdba98206dbbade69

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