Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd9d2c0472dffb2…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 19:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02a3480c2e77564f0cc9a7939aa50491 SHA-1: bb466f089220328fa76eccf604d31950c4b6c026 SHA-256: 1fd9d2c0472dffb264d782355da45c25470f10fc9b2747e875f622f9d64efbb8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly indicate malicious intent, likely related to exploitation or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://krisoc.ru/uplcv?utm_term=appzilla+app+download PDF link annotation
    • https://vhssirimpanam.org/ckfinder/userfiles/files/21930659427.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ve79jv42i4m4lqmgjuerd1lm4l/48537917108.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/jozugaz.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/34036954046.pdfIn PDF document text
    • http://atrsara.ir/resource/files/punaverazalaxidutarol.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/98473865372.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/85308588307.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/26383582583.pdfIn PDF document text
    • https://mlspoland.co/files/file/rapipuwufak.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210916101126.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac0f373d9e---fativokepukamanatiwapox.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/bb38402f783050e16c03820945cc33da/97206486717.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/zunogofepevigul.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/buxomuwifodofinixifaxut.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/94071985339.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/kovizuruvikizilorarawiw.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/19654687655.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/s2j5vc586sidj620lknn5q816f/7618221592.pdfIn PDF document text
    • http://519pf.com/userfiles/files/saxuregufonizekeluwaw.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/55363578903.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/fibapajeradigudozokajuvi.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bef43bf86---kufurigoteloga.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109150558136431.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/79872243722.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135134619855---neroxuxojejusat.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_off0000e033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE033 10016 bytes
SHA-256: 9f56b7e2a9faecc5e94bda0d113be0d9c8148eb1021a0f181cf9e9d44b9d31b6
font_01_sfnt_off0000f68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA1 18108 bytes
SHA-256: 68e0613ac0457262d436c2546e5f35a5696635559f647b95c839cc8b04121437

Open this report in the interactive analyzer, or submit your own file for analysis.