Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1a920611516b40…

MALICIOUS

PDF

147.7 KB Created: 2021-07-18 22:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: ff3bc8528d3faf455c44ba3a3ed5b7a4 SHA-1: 3f06c2690dee7bba9c51cd94d765f45d83f6027b SHA-256: 5f1a920611516b403be31a4dae977d5bff83335d1750606af207badd8bcf9ecb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm hosted on compromised CMS uploads, suggesting it's designed to redirect users to malicious sites. The presence of numerous unknown URLs further supports this, as they likely host phishing content or malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1515a0c72---98402855275.pdf In PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa36ba4a409---xolelizakipemoziboramiz.pdfIn PDF document text
    • https://saam.vn/images/content/file/magewosoxofun.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc827bdb6e---koturiwoga.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/bffq715h6c0o27k159kfqfgru5/51975408527.pdfIn PDF document text
    • http://sparkpro.lv/content/file/nupogutudejif.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a42eec12c---63598211186.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608685bf75a53---14190719660.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/menimaralaxikogulirujuf.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dbc57a63f---37316524236.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3982b875---setusajilomekip.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160841010a1cf0---nedetirud.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/7636818b5e98d99453e119d418e22266/ferakijelenezivolul.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4bm5p5dhslqlfclvuat6iaudka/sawemutofamun.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a29d6554fbd---zanowafezigepan.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/96169109165.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/028fc6a0d5367b7b7c475d2b5afaff95/27357169358.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062220373670554.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/12181234765.pdfIn PDF document text
    • https://anfauglir.com/images/file/30324062257.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/802fbe5031de033fc5cb260c10138a07/mabezarekirolukebid.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/96460754336.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/wadulanup.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16088e10ecc237---94083040847.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ad2d1193a---jiwewosuduruzig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fragrance+in+englishPDF 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_off0001d323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001eb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB35 25224 bytes
SHA-256: a2b830c2aba1d9ad5d47b6e73f9c467e73465d4e61b3137872bc9a3be84d41e5
font_02_sfnt_off00022a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22A27 10268 bytes
SHA-256: e7d6d947ae7366a376cd0e13519bbe57aac68992dc2f6e00b2e039a67b5376bb

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