Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44906706e56e13e…

MALICIOUS

PDF

93.2 KB Created: 2021-10-09 02:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a2717c91ea1a6fb292379277fb57ac16 SHA-1: 3434d2d8523dd63b669c95b56eff5ebcb57cc682 SHA-256: a44906706e56e13e7873e591c32d67943cae6b675f5d5858d308f38dd1e42199
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/181de5cee50103ea731b25890e9a2e2f/27679183967.pdf In PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/99178104334.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/6609064969.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155a9c3e8339---7370200015.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/57047669209.pdfIn PDF document text
    • http://turismo-usa.com/files/others/49344696313.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109290215563431.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161481f53910db---43004292385.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/31037770716.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/95770562655.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/molexeta.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/36996453350.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/bepewafugisuzipufa.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/l3umrt2ikn8e8chidb064r2nkt/39501900601.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/41109897867.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/89608669354.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/42271927703.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/29920521791.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/xerunexiwujuwu.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/damorotinogok.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/vapaxogazewobagasodonez.pdfIn PDF document text
    • http://asustainable.com/global/file/74030887780.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/nositaxebowa.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/jixufivifixipeparavavajor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=cell+signaling+biologyPDF 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_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 10368 bytes
SHA-256: ef373a652dda79d07f5f6534e4618233b3968a95452bb2545ba1327e83bff805
font_01_sfnt_off00011d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 19136 bytes
SHA-256: b483882d46a1b3fcdefbfd50c7bb655a2f5c858fc8f5c4ac61545123189f9a3b
font_02_sfnt_off00014edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1