Malicious PDF — malware analysis report

Static analysis result for SHA-256 1515372527acb4df…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 12:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 00c8d2740f3a6ee53ad680b4cff401d5 SHA-1: cd609ab6f68dad5c452ffedfefc261468ca0a7ca SHA-256: 1515372527acb4dfd0c415be2e0d02ada0f266c16fd2474e2b8027c2b4f0cb0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bed548c98---kapejor.pdf In PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f49744d203---vidifofusovuwijifufitewa.pdfIn PDF document text
    • http://trimblehighalumni.com/clients/84492/File/kakepeloripirevevakekenek.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/1gd7cj58frfnp42e4428t8et82/nopolaxo.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/kelegiwebonuved.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/dc480fee45da97d432f110b391571686/niveroxaxolamofu.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/lujoxoxivejugirewa.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/sepawexibekivuri.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/25e04f062d5e0714961e6a835affe016/wefabapu.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/37b53b6f20e8d8eec33e58b9baba0bfa/4403456865.pdfIn PDF document text
    • https://auto826.com/uploads/files/saxabaginiwukabared.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/57993406982.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/12589781024.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc075580d9---46163459262.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ek5k6jmono55fib959l3nc5270/loruwupegavaben.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/jeniv.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/60176189840.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/27138850437.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/14mcqv4dlq0tomhq5l9rnui6u6/84899447764.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/67458580309.pdfIn PDF document text
    • http://bptramptour.pl/files/file/93439431151.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d15c84b4b6---rotusesezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ictericia+con+acolia+y+coluria+pdfPDF 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_off0000da25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA25 20368 bytes
SHA-256: bd1e1772385a63cd01942c9d9c528bf1790c28fc2cffb9941ac129dc3bb99713
font_01_sfnt_off00010d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 10608 bytes
SHA-256: 2ab81b76d49e60a30b5a4f7b4f58e4ccde4731524df9f9f314ced61c7844b35e
font_02_sfnt_off000125d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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