Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b159d0794d14c49…

MALICIOUS

PDF

101.8 KB Created: 2021-06-29 14:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 88a86553beafdbf2f383a30f1c8f5ae1 SHA-1: 775a4e3938fbde3c20c027fa781ad42b4227fa0d SHA-256: 5b159d0794d14c495eed34eedca85a8cdbe9608efaa2eb6c8d1e31ee7528bf54
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 as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farm patterns indicates a likely spearphishing attachment used to redirect victims to potentially harmful 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 http://acecaalcoy.com/userfiles/file/86628625260.pdf In PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726081e47c1---norivabobalalagudafa.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/rakuxodizeninofawelokejep.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/petoweza.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/fepulumeloge.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be8041d2339---60512095865.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/lukeruranurerufetada.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/39820113112.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/706824ed169fbbdec1e8a36305f93d8f/61278451169.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c688c80475---lomafipejipivexutomejixuw.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607538008e626---lusobujagugo.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/bb6065d24aa45ff6ec19333942c8934e/2434864127.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7536f29f27---zarizekalax.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/77464741193.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160daea1def1ad---965046630.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/f57713905b7229d57281e186bd9a3a57/rusapedazowimatasad.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608349b492108---74235325683.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/nuxirepopizez.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021062802344311.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/99851962542.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fd3105f6f---84894494654.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1607e47c5033f6---xefavuni.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ce906ef3aee---12660277789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=list+of+english+proverbs+with+meaning+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_off00012b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B07 17120 bytes
SHA-256: 2f18b75f859602beaa4de284c6ea7eaf5b0fd13e3a228c85fb6407510d1360e7
font_01_sfnt_off000157f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157F2 11192 bytes
SHA-256: fb025bc7f03cce2f917157825e363c0b76257df2c07c4860f86138616cd3b20b
font_02_sfnt_off00017197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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