Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54a1733b9bfe5c2…

MALICIOUS

PDF

100.1 KB Created: 2021-09-16 00:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 32cc70ac57e92d1045b54eb1ba58cf8b SHA-1: 4d1be5097717b3fe749abdea0e16147b0e8d8b77 SHA-256: c54a1733b9bfe5c206ec66e1e65028292f7e4d8a1efc06e3c274193eb9758b2f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm used for redirection. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://huntic.ru/uplcv?utm_term=gaming+guruji+gta+sa+lite PDF link annotation
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/86620136827.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/73f26072f42789cc5096c726eb15c999/fopig.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/92867751362.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/47660602699.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/29543416655.pdfIn PDF document text
    • https://kimcert.org/E/file/7738115469.pdfIn PDF document text
    • http://www.bandungmesin.com/file/buwoso.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/33473462397.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/41923171029.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/33114753101.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/banuzarebulinemub.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/buwutobejizawopazelad.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/bebodimokipedogazizeniz.pdfIn PDF document text
    • https://red-adlay.com/upload/files/funijulolinojud.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/30400253259.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/14557188338.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/88514767800.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/7460644643.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddad8d8610---81626421214.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd518e0e07---tozemugigefozavevat.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/pifubulofu.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/41845235789.pdfIn PDF document text
    • https://onecre.com/images/content/files/12377753736.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_off00011d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001357d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357D 20468 bytes
SHA-256: ecf3c4620f59376611b2ec59e8a2d5adf8209adf89ea26c16f1b97e960b84eb2
font_02_sfnt_off00016b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B27 10600 bytes
SHA-256: fdc3072961cc9defe9a9776401fdc8a3777aa3da0aa26189cb6a52935d48b524

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