Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35e5d1be84ca838…

MALICIOUS

PDF

75.2 KB Created: 2021-08-08 14:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2be878042aef773b4fe8a7d252b296f6 SHA-1: 6eeeeb462443b4c335a894da161f335b0d19ea7f SHA-256: d35e5d1be84ca8383f0c9dccef442e8c8657effbe2720f3e1108751b701f4df1
256 Risk Score

Malware Insights

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

This PDF document is identified as a phishing lure, likely attempting to trick users into downloading and executing a second-stage payload by masquerading as a remote support tool. The document contains numerous links to potentially compromised CMS upload directories and disposable hosting, suggesting an effort to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 75 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8900d29f6---52509304784.pdf In PDF document text
    • http://kennycojewelry.com/userfiles/files/202107/1625555774.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a02046609---13356300045.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/dugewemalak.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/58264640838.pdfIn PDF document text
    • http://amesonsofallen.org/clients/53156/File/56039171805.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/h3bre8bophcb16pevg6hkag98j/kesatimarivelefama.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/mulirexaxelurewelutevipup.pdfIn PDF document text
    • http://posuni.com/userfiles/file/nonuxilogavovus.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/larapizifeko.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095493e832be---zakilanisuxelotipoba.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afb7c282534---sezixudovomeximo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zovulugusapafim.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210714101101.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d7dda7486d93e5e922f49fec1efaa4b7/zizavoser.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/nidakivo.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/xerorubufifatogojo.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/gerimab.pdfIn PDF document text
    • http://mobilieroccasion.fr/uploads/file/kofajegevefufibiwejigogop.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/95929108389.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f11344ade4b---92922692667.pdfIn PDF document text
    • https://schmitz.cz/res/file/68957157209.pdfIn PDF document text
    • http://gistys.com/userfiles/file/vunijapitiwofidanerividu.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/gabizukob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=speakout+upper+intermediate+2nd+edition+scribdPDF 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_off0000ca25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 11156 bytes
SHA-256: a2c3f14d24ea08b6736959bac8632d3c9647e8c8b445a2ead90a15d48ea454d1
font_02_sfnt_off0000fc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 13768 bytes
SHA-256: 97d3cdcb73b9adf22672640e1a35ca0fbedc315cbf29cf4626aa778224b2d83b

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