Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a952bee366bdc9e…

MALICIOUS

PDF

71.9 KB Created: 2021-09-30 16:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bd41aa6afd1bcb68c78d85a320b722bd SHA-1: 0762f4e5aad9d2f475e732970b64f96af6b3ae86 SHA-256: 7a952bee366bdc9e656bc01d7a759e9a9f956b1334ffb2f93bdf905938ae1f41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to lure users to malicious content. The presence of 'utm_term' in some URLs indicates tracking or redirection, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=adb+shell+mount PDF link annotation
    • https://holcom-wd.com/webroot/img/files/dafot.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/dobake.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/23879440402.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/4035397512.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613352d285310---31567741709.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc71ae43bf---52916955302.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/66307265315.pdfIn PDF document text
    • https://soechi.id/userfiles/file/zozisu.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/37235919637.pdfIn PDF document text
    • https://apelhijau.com/contents/files/90877759393.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/dunibalonapazovaxino.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/37093841653.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/31001404674.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/84266996325.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16139795f54614---63649785983.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/6311765231.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/rumalamubo.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/7190407616.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/jagezadawonavu.pdfIn PDF document text
    • https://zzhqhi.com/d/files/renexinodiwatukunorez.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/zogofefokemanezikuv.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/67458038484.pdfIn PDF document text
    • https://iohrp.org/f_files/files/48192663056.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141480545e01---leronilipizelewadepo.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_off0000b346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB346 18752 bytes
SHA-256: da494dd9bb87ebb552d206393c30513014d7fe63fe7120bab2c48a5744f0e8c2
font_01_sfnt_off0000e2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D0 10380 bytes
SHA-256: bc04f20ea7f767d2d765876ca0cb0faafd0f9c42f587e806eee74c46e8cc1591
font_02_sfnt_off0000fa26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1