Malicious PDF — malware analysis report

Static analysis result for SHA-256 337c6f9faef95522…

MALICIOUS

PDF

78.2 KB Created: 2021-09-06 11:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 23cb6fe495e94cf03fd00de8f0ad2cd1 SHA-1: 446968c3962b5578cff09bb66a3b455a4456f8c1 SHA-256: 337c6f9faef95522f2ffb9f37ad8b308ef8032755a7f9410ee863e1422662a12
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of embedded URLs and the nature of the heuristics strongly suggest an attack pattern involving spearphishing attachments leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/53a8efbbfe7a78394bcd833791ae3a62/zeberik.pdf In PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c7de8b03b817d20915a44c0f2b34c040/72609163655.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/doleturojotulaw.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/5bf20ed10c3707a54c62f468f5b75247/fazam.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/70684027240.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/52257279180.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/23993580871.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/9973b6347237b8d463d7840012fad50d/dovivipetimexaset.pdfIn PDF document text
    • http://snft.ro/media/file/gupixomunedet.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/27337475632.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/48628848196.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/75265211847.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/getowexijexenadamawukep.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802fd3e6d92---roduzevexasakev.pdfIn PDF document text
    • https://equinox-e.com/upload/files/goduketagubepis.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/71983097932.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/92700856445.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/73289379916.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/63111842853.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160703b9a18c58---51056642541.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/befovaxunirasolafuz.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb4ed3a500---15273908547.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d95dd134ae8---21150437430.pdfIn PDF document text
    • http://indemo.pl/Image/files/96839789369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=minnesota+driver%27s+manual+worksheet+answersPDF 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_off0000ccbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBB 17572 bytes
SHA-256: f3ed6cf3a5b0e4ea765ddee0d7afcf9d6028e6f0e9cf8bacdfbe9eefb097db11
font_01_sfnt_off0000f9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A7 10884 bytes
SHA-256: 67221fe0c2efdadab4830ce831f983dbe7613a968a6fe6d70fe93bded55a8ac1
font_02_sfnt_off000112b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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