Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a1bc1d38be6e6b…

MALICIOUS

PDF

87.1 KB Created: 2021-08-17 06:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8123fd63d472d7d847d6a85823b85cb3 SHA-1: 9c55d93efb105b48d9cce91a30b394e20bf2c8a4 SHA-256: 92a1bc1d38be6e6b1550c81afe49738c6242727b33a600eaff59f700d6fb2b3f
164 Risk Score

Malware Insights

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

The file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites, suggesting an attempt to redirect users to malicious content or downloads. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pxmonastery.org/CKEdit/upload/files/jilivirimoxikozav.pdf In PDF document text
    • http://africa-emergence2019.com/userfiles/file/womep.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c340829310---wowiwegeripidifapusef.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae4247de7---73733403869.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/9139333009.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082528cb0f82---kolulufuladadomolavax.pdfIn PDF document text
    • https://plasy.com/uploads/file/sexodekobavat.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1f39e3d459---futiferote.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607410d5df702---xazawiwibaguweleda.pdfIn PDF document text
    • http://marymo.ru/uploads/files/fuwofidakubozagaferuvavik.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/85531927596.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/61435882534.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8fa280a44f---29440308329.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792297e45a8---vixenijemavat.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0e56c82f0---sedaxajutobiruwawofo.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/96ef285bee8c51fcc8bf2e3de6561336/japepisifewinij.pdfIn PDF document text
    • https://altbuket.ru/files/laxetipuxogejasuvi.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/dunozun.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/7402732359.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/zarejuneretaredup.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/tagufigox.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/167e4c1efa72d9cdb37807b0b2906971/xobezosaxaz.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d477ebfdd5---25416730300.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/97554090036.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/68360891691.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b4b4681a7bff5513429e9b3431054c69/36987411776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=vishwaroopam+2+telugu+full+movie+hd+downloadPDF 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_off0000ef1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1F 17080 bytes
SHA-256: 0bffd302352e1bcf715569e38ec29f0735f23f81409e0205e4e8e5b4c13e70d4
font_01_sfnt_off00011b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13377 11288 bytes
SHA-256: 86e31c1f8aa848a3e068a783c1104a2f46d35e78ef1384047ecba39c47948f73