Malicious PDF — malware analysis report

Static analysis result for SHA-256 40073eec7e776b1d…

MALICIOUS

PDF

94.3 KB Created: 2021-09-12 22:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 926e60821fd22abfbb61f2d728048074 SHA-1: 78cb01f2aca7a86a8903ea3804ce86689b326eae SHA-256: 40073eec7e776b1dc801588bc9af0d7af2c9f7c4d267df4ba9d3af6ba53ba25b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://abwrva.com/uploads/files/7572208053.pdf In PDF document text
    • https://bamfieldrental.com/userfiles/file/11249552059.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130339b36b9f---pabipafozeluxuvotitan.pdfIn PDF document text
    • http://goldia.cz/data/file/23898388198.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/70703929095.pdfIn PDF document text
    • http://arsvet.ru/img/upload/tuwafixumugogi.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/58151590478.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/26764570759.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/88358808994.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea9bf60b41---supexonexeboguminosij.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/jisogixonipuveruxenu.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/8bccdc5ff75bb9442a0ccf1dcbe3a16e.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/klq816s1l5nhmehpknogfj2de6/61651582078.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/82161530784.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/46668083119.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383c5914b53---nuwovu.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/94220102215.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ang4rlv8lq5b3q8msnhbddkiec/31748883348.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134684f3bd6a---wasimifup.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/kobofu.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/bigegobipewaz.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/43692305685.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/zavuluzubisurup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fifa+2015+android+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC70 25504 bytes
SHA-256: f79d4dcdba6e0334a670e6e1840c297c577a08a9ced0234817fd53badfe131c9
font_01_sfnt_off00011c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13451 16156 bytes
SHA-256: e5763009db88f05876a7681a7155bc813abc0cc4a41a619b8d8bad653269fc1f
font_03_sfnt_off000149eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149EB 10440 bytes
SHA-256: f231afee90dc7a3fe48c9385a0db69a93d773e2f28248cc4b207632239596c3a
font_04_sfnt_off000161c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161C1 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51

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