Malicious PDF — malware analysis report

Static analysis result for SHA-256 811dd8820535eaa5…

MALICIOUS

PDF

88.7 KB Created: 2021-07-10 01:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1c277b0bfd128fc5e59fd8741b1e38a6 SHA-1: 6540c43bbc0e60789f04251bddef0c7f6ed6f964 SHA-256: 811dd8820535eaa59a787a0d6a781aa4d4e8d0c6016ba5e53753cc107cc35eb4
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The presence of multiple unknown and potentially compromised URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/66bc175cc2d13f2dd24a7ac5865953a2/genonifipibiwu.pdf In PDF document text
    • http://www.cbs-emballages.com/upload/file/mibezebelovonel.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/86973487591.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a0695f6ec98---19853539482.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/l60jv2t9104a7c8m5njac0or8c/rafiwivobepajivavafevab.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/79700448917.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/emgkirqedrl9p9pbon4thvobt0/sudakobinasilibaratitosup.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/8792456456.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/9aab31679762661e5dc36944c447eb3a/tojapuxijamoguri.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/kojijapunijamogofi.pdfIn PDF document text
    • https://vestol.bg/files/file/xagabomizibivatawa.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/87378275431.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/mukimukipesuj.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f94a05c4b6dd7f7694f524894265fb1a/vumajugomuveb.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ou54irst6saekk6dquo44gvg4t/78274338628.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ba052a85---37498355528.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160986bd33d813---benekikeminedaxukutasisus.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/08c0303d948ea85960d6e61025a48d1c/kovogokogep.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/24180074178.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/rj05snajrgj6san6fmiu3ingn4/79950141569.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/b43e8eeed023fee37825b7f1d9d30457/6611802711.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ig959b5o5b17sbrai195v1kjrs/12728908662.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/44339067942.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160736f5b6c3a1---4204731050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sample+letter+of+recommendation+forPDF 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_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 17668 bytes
SHA-256: b997c8f926878f14871f11fc1a8db67227117037bebfb710e621ec13525c43db
font_01_sfnt_off00012526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12526 10688 bytes
SHA-256: d0b4b18fc610488b242d4e69735712f996736ba0bda5b7dee1e3306f6d2cf11c
font_02_sfnt_off00013d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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