Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65ba2e5f5a2c497…

MALICIOUS

PDF

70.4 KB Created: 2021-10-04 01:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e552c5ea1485e418930f15ebf4964185 SHA-1: b22a972290c543469db8057a82346d04dfa2fe75 SHA-256: a65ba2e5f5a2c49765dbb6fd5f33aa9c3cdf797722955bcc72717edadab66123
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. This behavior is indicative of a link farm designed to lure users to malicious content or for SEO poisoning. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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://pistant.ru/uplcv?utm_term=the+woman+in+cabin+10+pdf+free+download PDF link annotation
    • http://soft-pro.hr/upload/datoteke/33999909759.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/kadodetozol.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/27053937160.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/be3bgba03cfgc0dq8lgqu02mj1/72411524543.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/tijamixutunu.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/87133516847.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/58957321871.pdfIn PDF document text
    • https://hoavily.com/uploads/files/1450460882.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/25952297058.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138315313aaa---norabosaxesibibuludu.pdfIn PDF document text
    • http://ihdbd.org/upload/files/noruf.pdfIn PDF document text
    • http://formacio.fic.cat/uploads/file/wojikabifefikekif.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/1335775893.pdfIn PDF document text
    • http://belovosushi.ru/files/2783429266.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/10606746376.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/1996602685.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210911_EF6083F0463763C3.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/31125400093.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/wovobijawivijobamup.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/fovurifidimunidomeguned.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130df83e2459---ziwoxeweragawibi.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/13942498245.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/5876058106.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_off0000b241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB241 16212 bytes
SHA-256: 282f1610724773fbde3e63fe57a27e688b08b61dbfd75c09b39dd2a46efb85ec
font_01_sfnt_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20A 10984 bytes
SHA-256: 7d8e152b053526ab6b665e6c659eaa68d5276cee3e08ade54152ebe45d313072