Malicious PDF — malware analysis report

Static analysis result for SHA-256 4238453243f103c2…

MALICIOUS

PDF

76.8 KB Created: 2021-09-10 04:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 96f8f9107a772b65fb6509553799adcb SHA-1: b9f257244dc983430a84c23db5aaf140924364d3 SHA-256: 4238453243f103c29b5b6bbf844e025ec28a497661822ea527357bd364358af8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to lead the user to a malicious site. No scripts were extracted, but the overall structure and heuristic firings point to a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://chcial.ru/uplcv?utm_term=why+i+cannot+download+in+play+store PDF link annotation
    • http://princeverma.in/uploads/files/21332981992.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/zafujus.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/sodatututare.pdfIn PDF document text
    • http://sbairs.com/datas/files/11721413607.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/gejolubeluvupito.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/33654764313.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/jebapizegujapijojesogava.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/bolekodenefo.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/70463490368.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/ritisolamovajufapugazapu.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/97508843195.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/b59sg7mtgl0psl5841idbj70rd/62553748732.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/xabirigikodo.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/33397721607.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/39761976490.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/hsc0kh5k5om5jn3efm8tr22nq5/56959359533.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/5312368284.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/gabirerifoduwena.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/25731941304.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/73809189884.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bf55937c0---5142247550.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/gazijod.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/kigefagomepuxanazoxinov.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/53765648204.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_off0000ca84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 10804 bytes
SHA-256: 4ec039f1be32b8cae355d4450e3de579d366d6db04eb4f406c4697ce300c43c2
font_02_sfnt_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 16412 bytes
SHA-256: d8b15ba9fed160e0a8ff3dbe211ee9ec1bfd83afe4782d3e16cfe89add4a1339