Malicious PDF — malware analysis report

Static analysis result for SHA-256 81986107e435e52f…

MALICIOUS

PDF

87.0 KB Created: 2021-09-19 22:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b4f42c685d1211d0f1e2f816c6ba8ef8 SHA-1: 131051098e6e12e2a978f1988d4a48e5d412c1d2 SHA-256: 81986107e435e52f6ec0e4f7d22d6aca12f6b5a7309a16408a3122f756246c37
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs that point to various domains, some of which appear to be compromised CMS upload directories. The primary purpose seems to be directing users to external content, potentially for phishing or malware distribution, rather than delivering a direct payload within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=free+illegal+sports+streaming+sites PDF link annotation
    • https://fo-prefectures.com/pages/files/jusajedutitapuv.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/73527333992.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/66764820677.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/55889757357.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133decf1798e---2892690428.pdfIn PDF document text
    • http://soc-in.com/data/media/files/24753630794.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/gibedasapotadivugasaxo.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd60c6d028---ziwunipavafizetisoruti.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/milenare.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/jujepukopo.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/lomeguwuzorezuleno.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/gedusubikam.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/zusotelazozon.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/tukejajuxumukutop.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/nasojegef.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0f02f12f0---dajube.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161472c4dba6e8---fuzejafibimur.pdfIn PDF document text
    • http://getdol.com/page_data/file/15936209758.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/29798628836.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/98530730234.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109120726458553.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/datutaturimifoma.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/78335846157.pdfIn PDF document text
    • http://contelex.it/userfiles/files/95292390725.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_off0000ee41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE41 18464 bytes
SHA-256: 244eacd1f6a6023d5b284d21f3ca09af6fc47b724c9bfff7023b67180ce14f84
font_01_sfnt_off00011e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E12 10572 bytes
SHA-256: 365585cb22d88debf7793f495f42d124f130f2e09f0e4e84a314d5999ee133dc
font_02_sfnt_off00013626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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