Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b2f7bc3eedab06…

MALICIOUS

PDF

100.5 KB Created: 2021-06-26 18:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cf8982d4e4d1efb979e6c991417bddad SHA-1: d463379c745a198e66beb5a3621538bd9f874207 SHA-256: e5b2f7bc3eedab068c593cb727ebfbd825deaa362f199ef4a31499d6924c331e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute phishing content or malware. While no scripts were explicitly extracted, the nature of the links and the detection indicate a high likelihood of malicious intent, possibly involving exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ksqf1qafb2k0s72ie2sd1rsjs0/52830378887.pdf In PDF document text
    • http://kpdb.org/userfiles/files/pagirami.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/46997699656.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/d1rrgpukfijbbo08f8su5ktj45/xotutaxezefadewadixefa.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/vuzetidasiwaziwo.pdfIn PDF document text
    • http://prmakeup.com/Image/files/66496828882.pdfIn PDF document text
    • https://whitesal.com/data/images/file/1461_20210611001248.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ec58b98a---54715980138.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084fe5958a38---mimasa.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8cb6ccf21---tifezatejusurigobi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d3de026ee---punuzerabasenimore.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070015ee310b---57187301853.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/10336387369.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/osvsudchvra7bdvui96i67i207/gazekipenovilimi.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608409c8d184d---34049760835.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/f452112e216a69d366c914a578940498/fesulovivolezonipujux.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8de29a93c6---weselusoruwem.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1813867ff---jipasubum.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/95198fde3cff26205f6d790a6f305fc9/48001591490.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/10138559217.pdfIn PDF document text
    • https://baongochoa.com/upload/file/xozizewukunivojatoxiviro.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806496696f1---pabaxaf.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/a8db7165380988ccaa9bb125dca394fe/70565011724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=spironolactone+100mg+tabletsPDF 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_off00012527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12527 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3E 11104 bytes
SHA-256: 4a2d92d16a75d11766af90fce386e272e7ed13b4f42435ed8cf11d9fdc929b92
font_02_sfnt_off000156ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156EF 17376 bytes
SHA-256: b9036d2ac282461f00ae99582283b0c5e68b6db22ea048db8296ac1c8e6c21c7

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