Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4d4a21dc20a349…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 18:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b869c9cbda9655a2fa4355c720eaf21c SHA-1: 784f00291d24d58507f2f0d4004a09d7c5ea921c SHA-256: 5b4d4a21dc20a349002a27842a5083ebb5a7fb92add2131b7ba641543015897e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=hide+and+lock+app PDF link annotation
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130e678dd001---55153104919.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/rogenaxober.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/23224921987.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/39189200986.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/44673780381.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/31071222899.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/81285335412.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/lasebigag.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/tepeverivi.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/64790542548.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/8749493886.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/57863443588.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/90436887959.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/01c19418828fdd620acfd6b301d2a15e/pogijuvaxadatereniz.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/fusasijiv.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/levalivevekigis.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/mizexojegevipez.pdfIn PDF document text
    • https://mollis.rs/files/xodivafiwuledopakuvalaxe.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/93760578171.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d82aae3ad851f9f9304ec21470767069/sadilogovutave.pdfIn PDF document text
    • https://adikkedua.com/contents/files/11556771774.pdfIn PDF document text
    • https://kawanmto.org/contents/files/duzave.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_off0000d2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 10224 bytes
SHA-256: 18a7aff6f8a3098862eaf940d5fea14a22361e2ba7d9232624112845472afd85
font_02_sfnt_off000101d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D6 18524 bytes
SHA-256: e3660751a4b5819b16b48d2b9dd7dd5ed330c57ef1ebec244738c66337038ff6