Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e11ee59b825b73…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 04:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d738fc24cbc8202ebc519947aa5b49eb SHA-1: 168ea2f776441209f70c9793452d314d13013c35 SHA-256: 79e11ee59b825b7398b95e18e24532a7fd2830299889863f6f266b2cccf4b563
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF is identified as a malicious screenshot lure, typical of phishing campaigns. It contains numerous links pointing to compromised WordPress sites, which in turn host further PDF files. The ML classifier strongly indicates maliciousness. The document's structure and embedded links suggest an attempt to redirect users to malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rp0o3jhchu7i46mpfviq79ec57/zopin.pdf
    • http://reguitti-engineering.it/userfiles/files/kijenojeki.pdf
    • http://wccflooring.com/userfiles/files/xapigesoburatoxi.pdf
    • http://flamefitnessstudio.com/cewit/images/file/55382551769.pdf
    • https://greenlandpark.com/uploads/files/42364470839.pdf
    • https://youxsoft.com/uploads/files/jasimefovapivexabifi.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b14d0ebb7dbb8750f52badb74422e99b/50372010515.pdf
    • http://espwireless.net/uploads/file/jegejiberasofagiku.pdf
    • http://arisutour.com/ckupload/files/mibejowezafurani.pdf
    • http://gdfsztal.com/uploadfile/files/64899588767.pdf
    • https://facades-et-traditions.com/actualites/file/goleworax.pdf
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/50413381964.pdf
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/73654674890.pdf
    • https://anukulagrotech.com/ci/userfiles/files/99343458138.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614dfe223605f---bewonebirometudiwu.pdf
    • http://biswasi.com/userfiles/files/90664326185.pdf
    • http://doktor-okonski.pl/uploadimg/file/rifineluxepazuno.pdf
    • https://nmg.lv/img/uploads/files/vexuv.pdf
    • http://proximeo.com/ckfinder/userfiles/files/putasadufikopezi.pdf
    • http://kimhoatra.vn/upload/fckimagesfile/21857805269.pdf
    • http://keralabiblesociety.com/fck_uploads/file/futojisazur.pdf
    • http://lienming-rubber.com/uploads/files/202109031624128764.pdf
    • http://charmingcurls.se/upload/file/34496556946.pdf
    • http://faceconnects.com/ci/userfiles/files/87049098212.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+retrieve+data+from+database+in+listview+in+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b035.bin
8aaf697c65d6d739c6747e015cc48d9a90c9d1f874998eeb8cb03ea0cc5fb6f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xB035 14512 bytes
font_01_sfnt_off0000d464.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD464 16792 bytes
font_02_sfnt_off0000ec7b.bin
07f2f831eefcd6f94a5e20f3ca0d78caf6ab41db1e87ea34fff9aa6440a48efa
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 10800 bytes