Malicious PDF — malware analysis report

Static analysis result for SHA-256 b875cb1a98a18dac…

MALICIOUS

PDF

87.2 KB Created: 2021-09-20 05:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 027342c59a3b05ae64f0d62f300d2cee SHA-1: be1e9b9c8bbb6fc369e712f8dd50d55d004f31e5 SHA-256: b875cb1a98a18dac74e4cd4f99595e2f55618955f8331ccf9dc8babbdd205297
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely serving as a dropper or phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=free+ml+diamonds+2021+apk PDF link annotation
    • http://aal.tw/uploads/htmlupload/files/92042379190.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/vofadalatileje.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/84702375754.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/bajimeg.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/veborepef.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/68930131440.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/vusimazide.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614574d479d03---wiboxer.pdfIn PDF document text
    • http://kag.fr/userfiles/file/lomitiwuzabadifebawazu.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/39746974209.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/3128609552.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/pidujuzamepogafuvibezugix.pdfIn PDF document text
    • https://andrejc.si/files/file/konuxujit.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210904191257.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/18887957839.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/11308342541.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/32714844357.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fca59d04c---futovekipimawaj.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddc8999e7d---wuzibomurawarawak.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/josuze.pdfIn PDF document text
    • https://funbugs.ie/files/file/47208551491.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/5530677958.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/kitibajotakupeluvatuj.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/xevezof.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_off0000f035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 17660 bytes
SHA-256: e97a4eef0cd6e40eadcc825eb3b81d419bb335882962a48058e500aff66a5590
font_01_sfnt_off00011e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E11 10820 bytes
SHA-256: c857e8532a2653935ab0f2d82f1fdecb5f25168a2ccbe14fa6c5ecdb892f1d24
font_02_sfnt_off000136f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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