Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a75471dd1b21e2…

MALICIOUS

PDF

100.6 KB Created: 2021-08-01 04:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6593ea2fb47282fa8e2e3374cbddbc55 SHA-1: 161adb3d9a6a5284c254bb0da97a0e6ccef99177 SHA-256: 64a75471dd1b21e2b4bf3eb341c2e0023390b5fe7f589a435c11f5bc99198807
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and other potentially compromised sites, suggesting it is used to redirect users to malicious content. The PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://healthmatters.me/userfiles/file/76159024835.pdf In PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77a9a4a1f5---59309717244.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797fe78c03d---6267239101.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/51519079975.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/fanufulevok.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/89072191118.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/sezusaka.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c05fd27ef6---70919291654.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/50650257125.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091d2281f350---bipekowepinijimoravi.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/k69q45ceu02skitcb1g2glqk8r/68784861006.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/fd203097199e665d971107f9060a0163/31216655867.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/a2e818371cb78cdf4e2656297180b30c/26339022243.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/9130530505.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/8769481584.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098331d98432---tineriwigerunojuvi.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ehvuu6ah48ekpa1pnh3cbb4rf0/70953704807.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/h6pam7iffrp2gu96a56kmll8t2/vokasogexusujazon.pdfIn PDF document text
    • http://mobilenmr.com/files/files/80712419537.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gomelupebo.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/66559193403.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/89120088772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=what+is+the+similarity+between+sexual+reproduction+and+asexual+reproductionPDF 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_off00012233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12233 17680 bytes
SHA-256: bd551420a1ea28b2bb8b454a62fb5e321d5498e468a4b2f851afee61829f341c
font_01_sfnt_off00015085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15085 11316 bytes
SHA-256: c4e51e5f0e93991260e93503e7fee9fb41fceb9e101b7784946f7a8e36f1cf93
font_02_sfnt_off00016acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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