Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2a3640d656b540…

MALICIOUS

PDF

75.2 KB Created: 2021-09-18 00:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 33629002407ce283ed2f3ac4fc405bf1 SHA-1: 9afe88ee9e61d1e715d89874cf1e9748a508f9e5 SHA-256: 4f2a3640d656b54019a435d362291bcffe2bfd96cc5b2de1f6c6beec92b3c20d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a QR code lure heuristic further supports the phishing or redirection intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://alsace.annuaire-regional.com/ckfinder/userfiles/files/99822071608.pdf In PDF document text
    • http://haozuowenwang.com/imagefiles/file/52977053516.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/22461652388.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/viwej.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/83674405722.pdfIn PDF document text
    • https://thepainter.asia/upload/files/gafenasijuzulitegafeno.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/zasejodimejakujosiwo.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/78177659002.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/89057030368.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/kojelibagina.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/poviritorakup.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c1bef34ac---sariwezipepopizi.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/57268870012.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/47543843128.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3005370ed---bodagazikeluv.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/18024410016.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/77921861435.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/wizeliziguzaxuxeguwibib.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/lopixanoketanajumoxe.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/notenorimikefege.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613847718d68b---22253890221.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613da426628a6---83010534557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=schaum%27s+outline+of+linear+algebra+6th+edition+pdfPDF 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_off0000c26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26F 11584 bytes
SHA-256: 526eed0ea1d5f0785ee8106b05f8760e5a2dd7c0259326cb98843dfe62e9fd2f
font_01_sfnt_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 16196 bytes
SHA-256: 9679b27ca3edfe8c7a393bc158d8eab408cb03185222ff6673af67d499961e33
font_02_sfnt_off000106ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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