Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc75bc3bf45eb9eb…

MALICIOUS

PDF

95.3 KB Created: 2021-06-30 05:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad1aacc3ec9db9d5a9876f6d0dcd12fc SHA-1: 87079c46de529fa95e822b8b72d9da52d7e9f1f7 SHA-256: dc75bc3bf45eb9eb8cc6a12d1da38c7bf08842b62463afb4c657cf0719a4181b
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS upload storage and disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/8sabnvbflje9fha4so3mgf2b08/2557562818.pdf In PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/1900e3667b977eb104fa65a26a39886b/73615584632.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/78691578412.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/depidokitimu.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e12d3ceab---88209862774.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084a44fa86fe---72712674671.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/sl3r8goti4pceg14cnv9gjk9ah/pobivimowupalurid.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/fp0hh470ssbs1q3bs9e05gfk0t/javuvi.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/de3av1ji3eo8ru721b043pc7ej/kodenarabafusugolegedav.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/ketomifotirevuzanurawu.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/nvr3vhme0jp4rc1av5vvh6b3up/59109200104.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609230508d49b---daduzabetituvuwaf.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/10936135762.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f814d7277---posobatuvepefuluk.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/kozosuvodutujoduzibovutu.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/32a4de239c7a0cfb5ea3c0f7c127cc01/24325455121.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb3e9d81a6---sadefanewuparagigijimoz.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098732547b2d---galuresotejevonojo.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fde5a5903241e11817f94e8d45eda0fc/30487513749.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/0d18fc0a6de2a7c526ad921d20973471/24834408091.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/de3a1a90997bb0d9cb11525735e0dccf/zebafemamamizoxegaborujo.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/fd64537d259e27faba6487f85eda4630/lobuxuduzedewapagis.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/rupulinipanut.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab62a552e1d---18728082412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=playwright+of+oedipus+rexPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11335 11076 bytes
SHA-256: fb89a4f685195a3a016325fda7959aec48bc2c26e06113295d4afa89b50dd07a
font_02_sfnt_off00012d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D09 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_03_sfnt_off000142e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E5 17304 bytes
SHA-256: cec24e49140895e74e5031dd6ed88f2f2cd89ca53fbe726c95647239f3dc983a

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