Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55a47b401ff0777…

MALICIOUS

PDF

83.5 KB Created: 2021-08-18 22:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 93f22b866fb1d3839b5e94fa1fe6d0d0 SHA-1: 7330b9f0719d91cd97de3c1383f42ca43e74b40d SHA-256: f55a47b401ff077796f0c496c699920e61f30b455f2ecc84961dca6482ad3320
156 Risk Score

Malware Insights

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

The file is a PDF that contains a link farm pointing to multiple PDF files hosted on compromised websites, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly suggest malicious intent. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab79c06c24---tugetimadozur.pdf In PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/bowezo.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a084a95aec---16057400326.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/ddul5hq7uesmvtidu9fra28nr3/finogarukesefojepenemuk.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3f21ac17586a1f74947d2cc0e3ba5ff5/77580997162.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/54830333296.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/milakax.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070b5fae1a7a---laronufegopanudujuji.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/munamasupidokupoz.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/vevubudivam.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/10412525764.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/nekokepi.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/puxokodideg.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/94236968857.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/42469606043.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/97565429631.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/murolok.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/18285978634.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/14536857994.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/44646432381.pdfIn PDF document text
    • https://tantecoccole016.it/file/fefilikapivipedav.pdfIn PDF document text
    • http://bwc.lt/i/98090280109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=bubble+shooter+free+download+for+androidPDF 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_off0000e368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE368 10832 bytes
SHA-256: 98e65ba618faaaa2de481b22d503b5a8c2c08190251ace9ec3658c045a915517
font_01_sfnt_off0000fc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001147d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147D 16812 bytes
SHA-256: 1868c67e6c40d47a1aa7ab65eb602ff4a1a34666dbbf4c16cb744fb6577accfc

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