Malicious PDF — malware analysis report

Static analysis result for SHA-256 4abc1a61aa9eb080…

MALICIOUS

PDF

74.3 KB Created: 2021-09-16 21:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0a643658c91de21c837bf0936660d0ce SHA-1: 6fc9cda81a37e2e89058052372af42263972e3f2 SHA-256: 4abc1a61aa9eb080476d876b6d27e297341c32aff8ac98a65ec5dbffaa640f87
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Static analysis revealed that the PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://laborke.ru/uplcv?utm_term=can+you+bluetooth+iphone+to+android PDF link annotation
    • http://goodfortune.hk/UpLoadFile/file///wugutoroki.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338e4488040---juxam.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/11af554844e285b1f5499ec8da85ff9d/17003530166.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/xifosegoratewedaf.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/677695853.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/2952843246.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/nipomatadudip.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210913233742.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/81882522500.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/mivajarokexorirugikogo.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613475d03f7c7---gometonira.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/jizogoze.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/xolodili.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/18482764586.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/89227563255.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/lefovilewevesazaragara.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nuzejupevelibefadi.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/94807477342.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/14968227057.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/juxuwax.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/rumosilukoviju.pdfIn 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://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_off0000c018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC018 16724 bytes
SHA-256: 40bbc8ca957b129a084e103003b3922d1847eb33e9f35fba844f647c2c6a27bf
font_01_sfnt_off0000eadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 10704 bytes
SHA-256: 30312d9c4760ba859bfda18f432d3b688a278c678a956a9a8d7b45015d2f7e46