Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a94e1865d6cbbac…

MALICIOUS

PDF

96.2 KB Created: 2021-06-29 10:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7ad30d347e75ecb6482de7a86e8c07e2 SHA-1: 138f477b23a05e3b14619449066a58747b82575a SHA-256: 3a94e1865d6cbbac8039b700d4c7dd052478d86a4eef4f3fc54a0536ccd0068c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=fourier+coefficients+even+function PDF link annotation
    • https://pendekaremas.com/contents//files/xugagitorugedevukedel.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e76cd7d410---sotade.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/82334276791.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/zefosogorire.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1473e1735---34058857428.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/df96609ef51c2a9a8a9f6438bd08a9be/39148964924.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/e391018129fee3dbb0edfd67be2c5263/netomarekudetodizesizipuf.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a13a4ec9676---tesuraxizogifuvosawamum.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210513234441.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8890c8ec4---13852022857.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/087acc96376eeb08fb1e39ec15f17e43/89023078058.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608941b36713a---seporav.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/0b9qsrmri12lbg9dtsgl9nbivj/12145981930.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d757d11f133---midobel.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073641f7cafe---metoxufapiwopuwivebiza.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8586b9c14f854d4b4cc3c83d21e1e795/67793694841.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/bezizabasor.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/gaxoxoselemu.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/4ca5165155615c7880378fda1f969066/pazenetezi.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/58269631182.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d78d168088b87793b078ad09276e7b83/67799557148.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160744280da0da---rufowojifebemumanapafose.pdfIn PDF document text
    • http://charivne.info/images/file/goxakesepugamisaxeveku.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A2 10264 bytes
SHA-256: c481a9252342167377221e864e51b42b07d610502e5155319bdc92f1b16464d1
font_01_sfnt_off000120db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 1900 bytes
SHA-256: bced27375cd583721c63a2fc82da436771f52a2ccdb522a0980e792e2f9a23bb
font_02_sfnt_off000129bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000141cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CD 18580 bytes
SHA-256: 18a0ded16f0db7d8ab0fbed933635ae970ef0521b0d81476304117a1e52440f7

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