Malicious PDF — malware analysis report

Static analysis result for SHA-256 3124502cffad1c2b…

MALICIOUS

PDF

91.1 KB Created: 2021-09-07 04:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6ad439f339e5542998f858af9cb9f6f SHA-1: a50dce769b4595294b0ee89ce3d5e8926a1bc425 SHA-256: 3124502cffad1c2b86d4ed5a1e43a1643000a6a073e7018c58507b218b49407d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The presence of a visual download button further supports a phishing or malware distribution lure. The embedded JavaScript likely facilitates the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://irlanc.ru/uplcv?utm_term=fjalor+shqip+arabisht+pdf PDF link annotation
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/wunanebidikin.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/dutuzusetakem.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/rebipopedikawogegod.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/tebinitosoteraputi.pdfIn PDF document text
    • https://songhongresort.com/img/files/43454789605.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wakosarudobu.pdfIn PDF document text
    • http://kezmosas.hu/files/file/49538627296.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/dea0a2d733c1d1b5e123fbc64851f0a6/fometo.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/denonanegefiw.pdfIn PDF document text
    • http://webursitet.org/Files/file/61729301148.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c341a376f7f---jigorilazufasavaked.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/fukusoluvi.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/morikejirubu.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/duvanetoxiwa.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092199cd14b4---75598527307.pdfIn PDF document text
    • https://digireg.es/upload/riwawanotevuzapoxitutov.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/74984d2c98fce114f46c827b56c54c5a/sufepakuludokeluwil.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/xoligagozezofo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609859489c71a---tolegalemopevepop.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607080c422fdc---wotubivefod.pdfIn PDF document text
    • http://4rrecycle.com/files/file/faxomilaluxanane.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/xedotomem.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/15741776800.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
font_02_sfnt_off00010335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10335 22604 bytes
SHA-256: 66763ec238baf664b01ec425470c7ca965b0038a9684c49f8b78394e92ca7fc1
font_03_sfnt_off00013ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE8 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_04_sfnt_off00014573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14573 10752 bytes
SHA-256: 63cbecbcfd7f9c50ab4b989470efc034fcc91428d8036cf3abd02417705a9255

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