Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1fecf68e45d55c1…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 23:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8c3ad10c28be0d04edfa0c0f78c976de SHA-1: c40fb6fc18e60791c464447006d46353d9e86e74 SHA-256: b1fecf68e45d55c14e53d1bb59dd8a512e84572144be1bcfc4b07c0ad1da22e9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. No scripts were extracted, but the presence of multiple external links and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/fhrdtu22d4rsg7kp8s1vj2tq1r/86600791585.pdf In PDF document text
    • https://yuktogel.com/contents//files/72655456082.pdfIn PDF document text
    • http://uamarkets.com/images/file/kilegakuvovulawod.pdfIn PDF document text
    • https://petikdaun.com/contents//files/85216762943.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a01a6f4721f---29772249342.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/54194472024.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/masufujof.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18ec28fb7a---mulugixitafulekizifagad.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///9392265143.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/9675303261.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/rizalofegudemunejona.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759713b8ebb---libusukejokidomun.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/bda5882a5e14956f7873542451b282a1/kanulodil.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/viwavotifovimasafikana.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd71f2e3d3---97232294613.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/5e456d4e20a4034cfc2c4e96ea0478cf/lefifolazadisadakuro.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11a9d6d9bf---19744188659.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16089eb291018f---gebelunipuziw.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6d11ec9f8---bejimawosarikum.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8ad85f157---kupejerijagevujuvesoro.pdfIn PDF document text
    • https://brs.jo/userfiles/files/bekidovodubaw.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/52598186391.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/pesopile.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/34a81ae0627b9539e65abeea5e48408c/11152666586.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a5f697bc0d23ed9726a5c62bd9b37d8a/19326200947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sarna+en+perros+tratamiento+pdfPDF link annotation
    • 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_off0000dabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABF 10688 bytes
SHA-256: 543d21e388371b3ae8210413ee4f933dc9dba6d95addd0542e78b539ea18252c
font_01_sfnt_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B42 17500 bytes
SHA-256: 8e35d8bb5a4e53006fe0ddb73dfe98233e52efed9d573d6c57b7e0b07105a3a8

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