Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be1a09c8888d321…

MALICIOUS

PDF

89.9 KB Created: 2021-08-12 18:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 3944b982750c59585fcfb52c06e870fc SHA-1: 8c164ee69ad3e2806f3143b869f558cc0a047507 SHA-256: 7be1a09c8888d321af1d34161670eed2da53f8b313af3671d7a03c55d1e8cad4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML_NYX_PDF_MALICIOUS heuristic and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM rule strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=how+to+become+a+plasma+technician PDF link annotation
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/4e3b92341d3865fb460cb66fc229ac75/2824325689.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/zogivokova.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/84662674941.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/49569564699.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/narovisipisonivipezereva.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/zamipu.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/55594166164.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b4507555b9f---tabubejiwab.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/71653668262.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/torowuduzasin.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/78949280739.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b666a3327---159537011.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/tutonulufolin.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/tofiwewasolurutifo.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/11265273468.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/nqcrprmt3promn89750nnkjjd0/tigaduxekegativuravo.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/85871473140.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf03028575---40834102535.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a965278da16---pakum.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/7e496f4849b5981c95da0acd61b17be4/senisoxeweguruzedowigil.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/55377721402.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc83b64ded---29884041797.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43606626453.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/xunovagurowodod.pdfIn PDF document text
    • https://aromamarketing.md/img/files/67416032799.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_off0000fe15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 10756 bytes
SHA-256: ae960673bde55fa5f1e9c0fed3263fe7678994fc4053a60c5e9eeb4d86c96b4d
font_01_sfnt_off00011672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11672 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E84 16636 bytes
SHA-256: 902902f309e76174036749c4232a0f5d79aa0fdf52436c6f6f20357272535cc5