Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc899da80932840…

MALICIOUS

PDF

94.6 KB Created: 2021-06-28 06:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 5beca0f1b86a2e3816f23185b83e172e SHA-1: d5c0fa1e85dd4a71b6ed05ce7bd8fcced64ee1ed SHA-256: dbc899da80932840702489637c6530ec1002137c0615a7c80b2876edcf34a7a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=how+to+find+wavelength+from+displacement+time+graph PDF link annotation
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/clc04bq230k6knprabd6mdngi6/pixur.pdfIn PDF document text
    • http://limoride.net/gallery/file/diwilefefal.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b2469954332032bf30aa537041e612c6/99051525292.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f0d1e0b1e---misuronananuduwaxonu.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/v35ijfl63uhe66dkn0n5hhjmau/jimeviravuzogi.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/4822d1e3a6052221a4f2a04d11d37823/kojopupixe.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/fcc494fa172724d5a47b0aad804ba326/lunoferano.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b076c532241---3891157300.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160981edcba385---91789304528.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/19193233184.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b60518f9c7---83739242329.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/faeeb03f306445270deb68dfe03b6ccb/vubabat.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a574711101---65059521882.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609b958268cdb---6577740637.pdfIn PDF document text
    • https://ecoretras.com/file/87039213259.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/53bcae8d30d50190ad69f380057ee0d0/tusaperezomav.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/bigitipipiwanovozolamuk.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/d2d8c8ebf1af99733c6ea723ce2b4260/54256848882.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051510115673499.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/furodipesanafetodu.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qjdahhg1hqqdfk8ihrphhjl5t7/tizubibikepeliwobojagun.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/fenugasesogoxig.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_off00010de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE4 16932 bytes
SHA-256: 8997d455194679e05d2006fea26684f7e8cdc0f433136e2164717d6a36016d8e
font_01_sfnt_off00013a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A68 11208 bytes
SHA-256: dbef1d5b19cf64d4b82519cbd7c48032341ba3b28cc69e18a39034d68daf4ef5
font_02_sfnt_off00015443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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