Malicious PDF — malware analysis report

Static analysis result for SHA-256 951f904338fbbe16…

MALICIOUS

PDF

89.1 KB Created: 2021-09-18 21:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 608857393fffc7402d33c07bc0edebb2 SHA-1: b57fcc9d18360438cf2fef178507769e5e9ac1c3 SHA-256: 951f904338fbbe1670a72594ffded89958b1f9e52c55125e1cdd839744bbf3fa
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the document functions as a link farm, directing users to various PDF files hosted on compromised or disposable domains, likely as part of a phishing or malware distribution scheme. The presence of external URIs and link farms suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://baoholaodong24.baohohoanglong.com/userfiles/file/linitolufevij.pdf In PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/tawibitebu.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/70952416764.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/82437125239.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-4/20210904223427862275.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/jiluvaxoxomi.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/fabosijakuzinuzivov.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/zazapapogasifinaxixosifo.pdfIn PDF document text
    • https://adikketiga.com/contents/files/jozajif.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/lazixovotebobaj.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/22812819400.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210914042227.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4bc0f1baf---24054568436.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/81839020812.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/70427450300.pdfIn PDF document text
    • http://csc-027.com/userfiles/file/20210917014928_8dpd6x.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/67413438137.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/4366675256.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37954785736.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/jakuvevodezenuwava.pdfIn PDF document text
    • http://orderkai.com/uploads/files/76224412058.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210907061835.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140219ec9ee0---tonojajafubep.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/novav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=install+split+apkPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/30fc6f804b382778f095c812ea18745d/17226392226.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_off0000f7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 9936 bytes
SHA-256: 0b2647065ec4872314efc856961095cdb4bfab3a831f2673c0e74c499dd5cc96
font_01_sfnt_off00010dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D2 18728 bytes
SHA-256: 50f1363d2ee0a7fa151dc13b93fe1d2162039bf5fb4e858f08c8cdc3f2b58eba

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