Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa19ff9c349bb1f4…

MALICIOUS

PDF

68.3 KB Created: 2021-09-22 12:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 04c592099cec4f87484ee7d552c87a3f SHA-1: d9c521b7d60152e78773b075458ae9e9bf07f25c SHA-256: fa19ff9c349bb1f4bfac6adb4bbb2b027756efff44cd019a589eee98eb3e8d9c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristics indicate it's an image-only document designed to trick users into clicking embedded links, which are numerous and point to compromised CMS uploads and disposable hosting. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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 68 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://inwebjor.ru/uplcv?utm_term=the+lake+of+dead+languages+pdf PDF link annotation
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146eb06bbd99---kuxofuzosap.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/54355246740.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/tusotapekegejuberivip.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d7b1b42cd8500cac80a71be80af252c8/fuwoziteruwane.pdfIn PDF document text
    • https://tenhucchi.com/upload/files/rikulipisipolekisufejezeb.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/gumaze.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434cf6948fe---mojes.pdfIn PDF document text
    • https://keongracun.org/contents/files/woduvi.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/83190861705.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308ab765e96---20133277051.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/nubami.pdfIn PDF document text
    • http://shopabrang.com/images/files/wixate.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/zesexirowepuda.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/79852165432.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/jujoxudajorud.pdfIn PDF document text
    • http://kotolantopeni.cz/file/57911168895.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/lizodubavenopimejiwosikiw.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/44187134002.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/56901872359.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/bugomopatalov.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/20190252630.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/6c6c914d81e98497056eafbbd7a7b31c/89726271201.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC854 10644 bytes
SHA-256: 4cdfaf5044dc32192e18c755fab8f252e5b62d39daf26cc4958111d7c5066a4c
font_02_sfnt_off0000e06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 14068 bytes
SHA-256: 82a927b9f1375da16e24449751e7400cf1255a8d2be8d28c0cafa146cc31592d

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