Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a3ded424727c52…

MALICIOUS

PDF

76.0 KB Created: 2021-09-15 06:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c2900abcfd046312874b791599a0f72f SHA-1: fba947ebba54782bb85ddcb3c66d8148ab160a64 SHA-256: 80a3ded424727c52cd6d3e08c47727555fbb52490885c4aa863573672dd0e33f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/uplcv?utm_term=descargar+cheat+engine+para+android+sin+root PDF link annotation
    • http://menifee.hanasushichoice.com/uploads/files/bajuzobulujawirelalu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1c517a40f---sokezumagezegivizebar.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/lonizagid.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/razabovif.pdfIn PDF document text
    • https://lordoptika.hu/files/files/25886940486.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/45975851130.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/matejuba.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/rowalepaf.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/681533936.pdfIn PDF document text
    • http://tyextractor.com/d/files/zitovefi.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f8190369754bb11a34e3843bcede40f5/ziwozimilexaw.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/65664437927.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/51772232928.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/wubakuvejerimovoweruzev.pdfIn PDF document text
    • https://krossi.ru/images/content/files/14185698388.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/83454822604.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/0ee18e5ec3f52a0beee51b3822ab9880/funoze.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/40243374708.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/31498803767.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/33805676784.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/21448300508.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/liwiro.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd4850398d---zujew.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_off0000c3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3ED 17680 bytes
SHA-256: 206c8c7a0bf064294f12bf9b764e36d4081774dec85820f5ab5e31aadc07e80a
font_01_sfnt_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 10748 bytes
SHA-256: 5082138df02ad628f54e3f9b0c6335fde9f158da4b92ddfc29eadb94dd73efdc
font_02_sfnt_off00010a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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