Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafbccf0cbbd619b…

MALICIOUS

PDF

91.4 KB Created: 2021-06-26 06:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 880b1ef23c035f61dfe79c79717de0d5 SHA-1: a71b2d098b35a89d87194f62d87f6df513bab789 SHA-256: bafbccf0cbbd619bc0595adb7f7de0b4e623297c2cada7a371feead973726bc9
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads. The presence of a 'download button' heuristic suggests a lure to trick users into clicking links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.lugashotel.com/data/editorfile/vusata.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608873020e02f---30483063221.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb4e982149---53837367837.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/gubejarinigeb.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/df1a6cb07055c5a42dca5112d8afa2c3/lizadesematibulewu.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/mepegupipozenafa.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833910ae1c9---99777336742.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/9j62kick0f78luko3bed8bjmg7/wurowekinebofevojubu.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/eda6060e6e08e1272a71abe5aeea8eae/16813861402.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/eb6cbf2108069de249dac8341f88f936/paregutikelobep.pdfIn PDF document text
    • http://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/80924622426.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cda5987aee6---netaloxufimutenotunowub.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c62bc8320---madepulutamunizuvetevuza.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/fivukari.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/bekipupomimibidapanapipul.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9a0ce8f68029c2ca606ef19e387a9fa7/sukipetexumuxagurog.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/lowusejura.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0146a6f3b---fezelobodivixamoje.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021611104559693.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609859e179adb---25987703752.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/481d4aee381c681867bb4d96d3b6cf1f/32375030363.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fab816c54---sewurubuzoko.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c580e9dca14---46305185017.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/gulidegikuvejamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+teeth+whiten+in+photoshopPDF 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_off00010254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10254 17424 bytes
SHA-256: c0031ffc905b1c479218a6e3cca296a4ee4544e83723919121b6db5ea3753774
font_01_sfnt_off00013040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13040 10120 bytes
SHA-256: 8a6a475f0b4ebe7ae3d5de509e07a3b509f157b23ca90256cf67a6e196357093
font_02_sfnt_off000146d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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