Malicious PDF — malware analysis report

Static analysis result for SHA-256 5330bda326f100c6…

MALICIOUS

PDF

80.4 KB Created: 2021-10-05 16:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: be8bd8be9d723c7601ecf97fa54f648e SHA-1: 1689ad44768c89977a3f6b40e8c86e445d25b5b2 SHA-256: 5330bda326f100c65c61dcad1c048000090c77a8e201f86d49f212de4d4a56df
204 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' lure and ML classification further indicates malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to facilitate the download and execution of further malicious payloads, likely leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b4cd24532---22312524491.pdf In PDF document text
    • https://laznia-radom.pl/userfiles/file/runetojigipefefosusiwone.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/kusesomi.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/kugutuvotujuwawidi.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f545ea7f84---razuguta.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/4d0ddfbfe1588fcda7684dda150ffd22/27503704711.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/nebopegeniradijivi.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/nowulazebideno.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/24275748978.pdfIn PDF document text
    • http://zzquansu.cn/d/files/14164184556.pdfIn PDF document text
    • http://qdcmd.com/data/files/vutonipuk.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/refalawuvafosizep.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/13344662551.pdfIn macro / runtime command snippet
    • http://radtel-sport.pl/userfiles/file/lugetorurop.pdfIn macro / runtime command snippet
    • http://theponghop.com/upload/files/88537915798.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/vikogujifuwesiwenoguxa.pdfIn PDF document text
    • https://raselapp.com/userfiIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=12pm+et+to+gmtPDF link annotation
    • 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_off0000d6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0F 18372 bytes
SHA-256: 7bb1ccbac1e4e05d21fdf7b98762bfda05b9ad3f8f3545d6534affbf1c5676a7
font_02_sfnt_off00011efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFE 10000 bytes
SHA-256: 2c111cc778329e0f605f0a880fdc6db10f442b85e4513ef2bc5c4e5a550d62e7

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