Malicious PDF — malware analysis report

Static analysis result for SHA-256 973e48e68114fd9d…

MALICIOUS

PDF

69.2 KB Created: 2021-09-28 07:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 347b7b9bdebe204c6e533d9de810773f SHA-1: 2786ecac7600cd403cfa0fac8bee8a87f652cdb5 SHA-256: 973e48e68114fd9dbffbe2b9caedb4e93b105d8f9531e6b3767d5f7b7a527b52
184 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript, a common technique for executing malicious code or redirecting users to malicious sites. The heuristic firings indicate it's an image-based lure designed to trick users into clicking, and it hosts a large number of links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 69 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.
  • 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.
  • 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://ofertaromania.ro/ckfinder/userfiles/files/28719495047.pdf In PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1614aee2c5501a---mexisopazotularegosado.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/kijarerudizedun.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/17aa3923fbbcdfafe8ff2ac267c75caa/13280826621.pdfIn PDF document text
    • http://membranekeyboard.de/_data/file/nirowanexukizidolivered.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/73674733321.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/37925875746.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/xititipenariwu.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/75450731993.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/89610798487.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/64319244268.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/bimafewiwurude.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/bifojafedonogip.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/32196319897.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/u5hsnqe8tm65244jd43ibhrr77/12950060037.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/41280017926.pdfIn PDF document text
    • http://bdsductri.com/upload/files/serobakezekuto.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/4121306563.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/vogarato.pdfIn PDF document text
    • https://pmms-online.com/assets/file/numotoxebaluvakos.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/xajijifogapokupigenugozit.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613502b627ff6---57242464949.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/40251667300.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/21896750210.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/xikenonenel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=best+games+for+iphone+6+offlinePDF 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_off0000b123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93A 11028 bytes
SHA-256: 56c0ba456522f81f24609ad3bde5f07e6d029e5ffb9badf49c2b4dd4b9a50645
font_02_sfnt_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 14524 bytes
SHA-256: 9abe8e463f5f23a35dda1f58b52208fd3dc20ec3c6df7e5387727178dc52a98d

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