Malicious PDF — malware analysis report

Static analysis result for SHA-256 4531987f128fa174…

MALICIOUS

PDF

79.3 KB Created: 2021-09-01 17:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb7c5f132b60a9327a7a1ccdee8cddda SHA-1: ecd44b8359fda76db462e25a45c27bd3260c65fd SHA-256: 4531987f128fa17409f9d87862569a7dab43898d5f3fa8d9cf19932b8b26c6f6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 http://rosabaum.de/web/editor/files/makumurofopajikexutupus.pdf In PDF document text
    • https://ip-pharma.net/data/files/45068386267.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/lekamodug.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3d5aa51876fa428ecbb23be8167b7c4e/41371799856.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/rukitadoluzu.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/33580215331.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3a2ce4c5---83145190730.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/53401e7c14230677d60a0d15ea07b384/gobogodejunisago.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/57968424957.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/77nbgpfpiu83s1beoad0nuei95/zufalajefej.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/58758013498.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d74d8ea6da---burizolejepel.pdfIn PDF document text
    • https://ultralloy.net/upload/files/vulafa.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/gabamateto.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4381bbada---58662801574.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/gopolutobaxaweful.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/66244003777.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850f79d4f01---72540280045.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/29397893909.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/b06442b4e5e3c3a8a943480d58dee13b/39203436009.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/66217482742.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/pepakovezubamuz.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/99065917490.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/513276d643249d43300888a99bc01402/78048728054.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/90701673280.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/zabofodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=geography+of+rural+development+syllabusPDF 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_off0000ce9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B0 17596 bytes
SHA-256: 1dd6b0cb202394a3dea9b027f157cf6aec0bf3472e26a3fd25fcd879a8ce70ae
font_02_sfnt_off0001143d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143D 11312 bytes
SHA-256: 0ff26387537f2d53f4a0250ce202a8d4c08b48d7001d71a018cf365362e65b2b

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