Malicious PDF — malware analysis report

Static analysis result for SHA-256 bccb72deca1c78d4…

MALICIOUS

PDF

85.6 KB Created: 2021-09-04 04:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d97f7e30c3fc7628d5918e3e6f47dafc SHA-1: 277845981070f9a409427436229c6a3dbcc379bf SHA-256: bccb72deca1c78d4e2e3326d4ec932fe6716b608f3447a8f774bad9b71db1d9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lead the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=anemia+ferropenica+tratamiento+pdf PDF link annotation
    • http://jshanwoo.com/ckfinder/userfiles/files/sivajenedaji.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/3cb1a9d71dbd954b429ca67849b22c5c/depulowuk.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ee1fba086---divemerojagefalerujuzogab.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/brv2mds7g9r30fg14gfepvt8e5/51680768359.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/blcfaeu3gos2huainaavlt4c35/gaxapivubupal.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6c4a61ad3---kimaz.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160be56d82ab88---nipurofomizajunon.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e40f0c6687---bulug.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021710145946.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdbbfe5d09---muperatewejuw.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/eec565033478c7da36394970c26c44ff/89926342737.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/ziwezefakizofixoxujinegat.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/55047259909.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/623035426.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/f70004a4e2d96f3a683636773f508e10/81060472678.pdfIn PDF document text
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/34344029791.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/35622988513.pdfIn PDF document text
    • http://techbis.pl/files/file/jigix.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/72079642944.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161247c12d1ed9---58776107256.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210618_5809C0BF63D8BC87.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/92404926760.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/vexuzifutesosilikenijunu.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/70729332747.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_off0000e7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CD 19492 bytes
SHA-256: 1d73f8c42842990a21461ee03137bd6e081c95cdf4386bb5f20202f9c911df80
font_01_sfnt_off00011899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11899 10548 bytes
SHA-256: ca166f2759b021a84ed6cd45c3777d042a3c8a205d427db22035f5e75d6c5a88
font_02_sfnt_off0001309e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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