Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8611f486b1cfe39…

MALICIOUS

PDF

96.0 KB Created: 2021-08-14 23:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 380eaffc5e432904100e51276791e63a SHA-1: 52b6527ea408e270ba7ee589b45a2a9ffe27574a SHA-256: f8611f486b1cfe3992d7088c0941fbb985d0069b1427a8d1b50a1cbd1d18ce90
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a credential phishing lure impersonating Amazon. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the PDF structure and embedded links are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+get+approved+for+amazon+flex.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/48810383794.pdf In PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5518de8ad---zokuzifu.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/kixoxujususegoponedevebu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608867f32a49a---94425794411.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/40994921798.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/71c80f5e7f39ec008b70250fac05b39a/nunemitawuj.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/79675408064.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/83974736945.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111cf17c1d2c---minoset.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/27535804905.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/7e627c9c4dadccde8f955e9f62a26c87/98365124704.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/75cc05b28019eb0f1aad8f812bdc9cb8/zedusagosedoj.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/t95u1rtkddnljp9f7421dlnm7h/mojulokebabuwumu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf155ba4e23---36775024277.pdfIn PDF document text
    • http://airfa.it/userfiles/file/82059515351.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff59f136569---tevalowexezimaxa.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cec798c4430---69591541342.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210815_035841.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/42129824286.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16114f782a8330---tilulukinidek.pdfIn PDF document text
    • http://megalaserasia.com/upload///xelufefuxulujar.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/labodowodepuvusepuzagefon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+get+approved+for+amazon+flexPDF 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_off0001113b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113B 18336 bytes
SHA-256: 1fa680461e00cd1c16a74cae1197a7ddeaa88f2945dce3816dcf0e82c59981e2
font_01_sfnt_off000141aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C1 10884 bytes
SHA-256: b1c2d9695eb0294023193e58c150f9a73e2a3303759063603d5519938d7506b0