Malicious PDF — malware analysis report

Static analysis result for SHA-256 072c631a27b2c3c0…

MALICIOUS

PDF

73.6 KB Created: 2021-09-04 22:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ec6bb882e503d4220fba3e45d89a8a61 SHA-1: 55939286059a56b4d9246705abd4d0f713a9cc54 SHA-256: 072c631a27b2c3c02c17d4d84b1ed6f521f295970a309a0a641647f67b1e9eff
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests an attempt to leverage these sites for distributing malicious content or phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nbnjl.com/userfiles/files/59035200364.pdf In PDF document text
    • http://maybaobidinhdinh.com/upload/files/12772679978.pdfIn PDF document text
    • http://midel.me/userfiles/file/movarulokewuvesoxa.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/piwurajaduvos.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/61323739089.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160941481a6d92---24678863060.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc8f8b1bb4---67819074520.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98a394d1b3---25015369366.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/48305296872.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/26c4dc71039b4959b438ffec0e800eb3/49349620460.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/xerazedenanozasefu.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/nemetiru.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/lizemofarixutiruxowadu.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/xixoninimibed.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/79197551275.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/94045891031.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/47115418484.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad97474cbc3---josusafepubiwasemeg.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/bajudazofejixezesugi.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zediwosuvejibi.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/33066800598.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/5432053648.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611be1c4ef01d---80622281090.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/pafozetapuguviwafa.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/d35dc7a743c1d9c483ceedc33dfd0c40/fifoxune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gaza+strip+map+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8ED 18564 bytes
SHA-256: e4f1091e015b42559421a18336e42569191fb9d07eaa97237ffdd32b4f5577f1
font_01_sfnt_off0000e96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 10356 bytes
SHA-256: eaf45d0d2acef5b5abcda22024906fc7479cec81f0fd29e15e28fdf80d0300fb
font_02_sfnt_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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