Malicious PDF — malware analysis report

Static analysis result for SHA-256 370e470e69a7586f…

MALICIOUS

PDF

92.4 KB Created: 2021-07-14 06:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e161a738e79827ee55d6e0b368e106b SHA-1: de040e4f098f7ad56cef30a6af543ac7eda630ce SHA-256: 370e470e69a7586f8ba4d07a3fe1a31dae3da1003e51c6d6f493f931891049fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs are characteristic of malicious documents designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=contemporary+approach+to+management+pdf PDF link annotation
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/dbtql84m9ci2s22c4589080ob4/jinalidubijinaza.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0276d66b1---22261199757.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31887918594.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62aee792bf---47268753978.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd44263c47---55207003376.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c63f56ccab---76276153890.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/2vrpk4mqujtrdtg03ioj9ubbg3/jugigoxax.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/4uus96kl9u5cr4o25iunmh7t8q/dezakaxom.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/1507e0945cbdec890817d4f1fa523151/50839533225.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160927eae33a50---79219728745.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c7625cc31---bumokarom.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ef67d0a085cb4d4ad8ab80a50284e157/gezasedutujudimisefavi.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/9858840928.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0231e69a3---zisododujixusorisivevami.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160822ef624434---fixofudirek.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/tuladofuwopibubigit.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/p3c4mvq067nlfisvbesq2qcg33/wuvelilufojerinedigifozeb.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086099c71568---kanabekedelaba.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/1thembo75nr25sph64ohch0t5u/4062342673.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/10b6aad0e99246a975adbeb5d3153611/sinulefifes.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/dpp2d0r5ihs521hv2l8kv05uh4/toviwipaxovobaledovuju.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/74848035654.pdfIn 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://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_off00010777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10777 17080 bytes
SHA-256: d43766d0007180725c25f4cd8c2d9d5cb03ee4423ad72cfba08233ee648359de
font_01_sfnt_off00013391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13391 10904 bytes
SHA-256: bdac3f0be2fe3d1b97508725886acd0105a17307b6f68425f3f20ff998cf6ddc
font_02_sfnt_off00014c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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