Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4502a3e2e4a353…

MALICIOUS

PDF

73.0 KB Created: 2021-09-25 05:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6be7b78d21a188917f4e2849cad564ec SHA-1: 8afa848bb2b6c7b1d08c290ce83cb518c98e00f1 SHA-256: 9c4502a3e2e4a353eaed8dd669e435b59d3cee45422587ef90596222beadbb8f
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The PDF's structure and the presence of external links suggest it is part of a phishing campaign or a distribution vector for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.leasebridge.com/CKUPimg/files/38069812868.pdf In PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/41658686888.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be22b2bb52---71368370328.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/ximevisoletav.pdfIn PDF document text
    • http://klinok-saintp.ru/files/nexodowif.pdfIn PDF document text
    • http://coumert.com/images/file/fasikukafik.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/78894002579.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/zefuja.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/zelusubapujutemum.pdfIn PDF document text
    • http://keramann.ru/uploads/files/nikulag.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b0232800df1a375e6adbc3a9d507b7bb/7494320319.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/10885827585.pdfIn PDF document text
    • http://gr-chem.com/upload/files/bofojovepajipimazasav.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/zubibumirabevifadob.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/matodiko.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429f3b743dd---33337739020.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/53381736797.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/98974381505.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/161366c7fd80b3---66051685451.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/98ca6ee95ead0ddb2a21b0bd6ba7d328/bekapow.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/xekudizunulugubakebagiz.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091518071929.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/54107316080.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/digolunolesukoxezas.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/lunaxafewejuwiwepovexe.pdfIn PDF document text
    • http://auvergne.annuaire-regional.com/ckfinder/userfiles/files/nexefanukagasezasebaxuwob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+convert+a+landscape+pdf+to+portraitPDF 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_off0000b7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEA 10756 bytes
SHA-256: 14e4e0a9449d53354553981d5ec82423fec3dee1d3f0a39226499b21debd648c
font_02_sfnt_off0000e8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 17676 bytes
SHA-256: 0124de3d18f2c9f75c9ebe27d0a67514ffe2f52ebbdc1e0efdff010f856be6c5

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