Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eac3ae825e06486…

MALICIOUS

PDF

77.6 KB Created: 2021-09-05 13:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ab2ec3bd45fa3deee1b1e0cc57df5cd6 SHA-1: f109542203e2cf2b2d86d12e3eef55c17949910c SHA-256: 8eac3ae825e0648665be0f7f3cddcb75f951b80c23c1296987b58911ebf62451
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites, including WordPress upload directories, suggesting a tactic to host malicious content or redirect users. The presence of link farms on disposable hosting further indicates a malicious intent to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://huntic.ru/uplcv?utm_term=capitalization+worksheets+for+1st+graders PDF link annotation
    • http://namthangbasaltstone.com/uploads/image/files/11614180560.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/jevagedopawar.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c2ck9cj5pvl5m0rr5in33gfsb2/jitudowuzifexedagi.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/44835876580.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/suwuvenitebukivep.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06d101dd4e---ladapejisuge.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/12059721776.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/43742327256.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/40354137209.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/25705571065.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5s22pcd9ds4b5261lqgpkvgdv1/45732383871.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202108240549319342.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/monufatonupazune.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c639bbc5b8---kapuxitor.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161345eac0272a---36805850039.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0b4313f2---mogub.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/59413181823.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/81975411098.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202108100620594834.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/67956705430.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210815_73760F791B98247E.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/30407986768.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce8303b82d---19884176381.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/09e6316b28203b8c102e885d22148a87/fozuxoladi.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_off0000ca57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA57 11096 bytes
SHA-256: 8482b7dc05f05dc6bc16740cbf34ba105cb0faebac2768a99bc380d98089e298
font_01_sfnt_off0000e41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41C 17248 bytes
SHA-256: 2c89fc4645fb27ac355b0d6f078c11ef316dddc73b08e1303ed837c1f0702716
font_02_sfnt_off000110d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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