Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb9007bfcfe34de…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 22:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f45d7371461f0773783247ea944a2df1 SHA-1: 6acdee3780cb450c0ead6e177fe7ddf8dc851bcb SHA-256: acb9007bfcfe34de40a6f1f10a240f043ca3e5838e74521124c93cce617d77b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, some pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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 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://oniceh.ru/uplcv?utm_term=play+god+of+war+on+android PDF link annotation
    • http://autobedrijvenindex.nl/images/uploads/54922341007.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/jinatewekasodutupizopumak.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/6649573098.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614515a5091e2---71331613218.pdfIn PDF document text
    • https://rodotour.com/userfiles/file/88831978951.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/wilaxewowe.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/74063155088.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/1353370883.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/k6qpn33sqm30eafrqf2s4mnruc/fejonanovoligirasanu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613627cb8dc0c---lesopuleronoluwa.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/61184242213.pdfIn PDF document text
    • http://oilspecchem.com/files/65609915867.pdfIn PDF document text
    • https://tsegypt.com/file/70329228054.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/61557179258.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/ee97ee7a5a56d13cfa8d682f1b5efda8/juxudomitosafiwewukipu.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/lokoramiz.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/vasuzagu.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/nemosa.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/81778462815.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/70547661722.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a68b992dbc---668062241.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/99922421647.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130845ec67b7---10287298839.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/xufodigebabusodanajivu.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/3760326749.pdfIn PDF document text
    • https://lapdonline.org/file/lonuj.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_off0000b4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DE 15528 bytes
SHA-256: fbb34e9d3164b598eae0711adc63e479863523fe76322782d6fc1d656eae701d
font_01_sfnt_off0000db06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB06 10332 bytes
SHA-256: cedbf8756a3c542ab9e6a1862d8600f6c1809a15100bcf126435e8ff1fdd6ab3
font_02_sfnt_off0000f244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1