Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e127a188e5cde4…

MALICIOUS

PDF

79.7 KB Created: 2021-09-11 17:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: da812e2b1635f703bc4aae1cf15d06f2 SHA-1: efa6c6b05847dcabb58684e030c3eb41930857b4 SHA-256: a8e127a188e5cde4a020ac6a846e9fe7b97d9488aed2fe9e0844d257d626b08b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://domuran.pl/files/file/41277685522.pdf In PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/017378ea59a00fa0e3bb810f29764d96/60994012766.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/suviratewiruvofuviz.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/pevunenupuzukolewij.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/salotodasigezu.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/36319837959.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/31714764810.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109050011515918.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/wadoruwimekajuvagax.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ce1200dac---jazuleta.pdfIn PDF document text
    • http://fruitvita.com/files/files/jilewesepu.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79930750119.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/12593764108.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/jofotabedetofugaza.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/jinutabimuxivalowofudep.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/zumovebenufav.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/85211738696.pdfIn PDF document text
    • http://ombs.ru/uploads/files/40974693421.pdfIn PDF document text
    • http://crm333.com/documentos/file/99122425066.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/22241790983.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/60503200306.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/vulakodopib.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/c64d11a9d3c729c6d2c14302e4a30129/mifakaxazurapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=top+war+hacked+apkPDF 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_off0000d411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD411 10244 bytes
SHA-256: e59e3ee85eb50e2315dccda57494183c783f457b8b9cfcabff188c9f11f035ae
font_01_sfnt_off0000eb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 18008 bytes
SHA-256: 3689dc051dded925925f1fa0f9578ac9f40f5d2dbd2fab0ed51f18054a83e47f
font_02_sfnt_off000119ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1