Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19ac61bf472fa41…

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 05:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e416fb7d7015d57bfa402c7edba1ae42 SHA-1: a561d10ffede94ccd3daea62313d9594e2864cc4 SHA-256: b19ac61bf472fa41433edbf5334b263504890d4e640019b19a4742d8cc4ddf03
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on disposable or compromised domains, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification confirm its malicious nature, likely for phishing or malware delivery. No scripts were extracted, but the structure and URLs point to a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://gillsandgeckos.com/userfiles/file/wekebakojogumuxowukaju.pdf In PDF document text
    • http://pzhjintai.com/upload/files/46120323287.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/vefilatebiwe.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/wadapijizaxeluk.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/natales.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/6926730.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/23809569020.pdfIn PDF document text
    • https://angem.fr/userfiles/file/55174152410.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/jemaxawifowarepawamomufix.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161379311c4949---vulidodewamewi.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc9160eff---zogofazidatap.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///66555035975.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421c4e132ad---kalomomenut.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/gupagezitiz.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/zuvukijiguvoluna.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/97331201593.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/22563876872.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/banomebudukewus.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/50359821007.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/7465527807.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210911/file/lotivotutoserukusaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=bluefi+phone+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_off0000c9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BB 10336 bytes
SHA-256: 7e58a1a5ef31446c996b73aaae6439fe6d7561d66ba928099886b398070d7a70
font_02_sfnt_off0000f8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EE 22716 bytes
SHA-256: 707cbcef281eda2a2e9733a2f6174257137d9a935106919d7cbfc3cef5556727