Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90f01c683d996a4…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 12:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 834de9b5ae17e62d76504f9ba6f7daa4 SHA-1: 5329afe2b302d0371f888932d2500ad30cdeb9a3 SHA-256: a90f01c683d996a473d225cc27e7b920ace8a8b7275acfc8db592a2b887ae420
212 Risk Score

Malware Insights

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

The sample is a PDF document that contains embedded JavaScript and multiple external links, some of which point to compromised CMS upload storage. Heuristics indicate a lure for MFA harvesting and a visual download button, suggesting a phishing or credential theft attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick the user into downloading a second-stage payload or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://daks-96.com/f/uploads/files/20772088626.pdf In PDF document text
    • https://nmg.lv/img/uploads/files/dilisagonurufawukogobes.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/lovabuz.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1407e4f9d---fowetamamevivitoxadiwi.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/55637823.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/reragazasowiwujulubejuwe.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/vetutaf.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/45444460537.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/muwoluzixoboluzuxi.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/gesikimos.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/podijudavudadoligadoke.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/lomikurivalularop.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8072700f6---xokefimopenebawazox.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/namixurezarizuki.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-04/a249f71002d14ebbeb5ebeb27f8d891d.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/79452597165.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/sipus.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210912_A9D1BE04081F3300.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/96649167288.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161397f96434f8---veleguleteda.pdfIn PDF document text
    • https://terracell.pt/images/file/63356608307.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/sireboxowaxutixarorexofu.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/29049431060.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbe99181d7---tedolodewilap.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/fef936a54b16dedbd81ab4a770ce9e73/wefebotigi.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/bulozoluzote.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/zigasozusajogeniduna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=redmi+note+9+pro+software+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 10960 bytes
SHA-256: ed925ebc858919f33aaf9c5f221fa8212513cc649079125ca192afd95f6a2318
font_02_sfnt_off00010ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE3 18372 bytes
SHA-256: 8a8c2786febb110e5b26e92074650a3b173438dc0c596beae255fa7addf872cd

Open this report in the interactive analyzer, or submit your own file for analysis.