Malicious PDF — malware analysis report

Static analysis result for SHA-256 5765e39f71c26860…

MALICIOUS

PDF

94.3 KB Created: 2021-06-09 19:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1ac28dc2465bf546507e54de185db371 SHA-1: ddd7fc51afe6384540ed72755aec7a51884b1258 SHA-256: 5765e39f71c26860be1337e80ed399974129ee7f11d285ec7edea9d00cc0d6d1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised CMS uploads, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or phishing pages. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/uplcv?utm_term=review+of+related+literature+about+banana+peel+as+bioplastic PDF link annotation
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e6a7840bf214a8a4b15873126e9f002d/zufajirefoxe.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/80745092083.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad718479868---gumotevadelafa.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/kexudaworotase.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608228baba05c---17903077467.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/tuxemilavodojujarozop.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3e4440a78f26c61fb7bb0756efae4c39/28480039802.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078837013df4---gobarekugigibipuzikam.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ldh7q038d60farjf0fn26dsm48/97908900349.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607204ea579dc---vedizavirirawoba.pdfIn PDF document text
    • http://envigest.cz/upload/file/96536943057.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/8cbce26b21af22c736d15d8c8ae7a0af/90310131855.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160845c1319158---54466533491.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/1jqitabgvb8aolbb9huju374so/24401027557.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b785f7750cd---23333532969.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/vikefumepigelalepijiwukoz.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/cq5va78b2c7v9gqjq7kvjh75oa/zekuxutegatab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13224 5448 bytes
SHA-256: 74f3a42ed8046706fa21b82d8b924c24ff1d8f92100800a8a2dd6f832ead00b8
font_01_sfnt_off000144cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144CF 11412 bytes
SHA-256: fb58e69cc9770b7816591900110d18990d1a14425b74abfb9ef1b54a2bcf161d