Malicious PDF — malware analysis report

Static analysis result for SHA-256 8611e5ad24a000fb…

MALICIOUS

PDF

77.2 KB Created: 2021-09-21 02:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 546398a627a1a80f4197afbace133ee9 SHA-1: 59663602f2f4d1b7d21c5a04d24e62cd55015d38 SHA-256: 8611e5ad24a000fbebd88817bd4d7a2fc6b0343c3fa38d3dd6af9dc71db372b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple PDF files hosted on various domains, some of which are identified as compromised CMS uploads. The document's structure and embedded links suggest it is designed to lead users to malicious content, likely for phishing or to download further stages of malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://viprealestatebrokers.com/userfiles/files/35074084036.pdf In PDF document text
    • https://sleepthai.com/piceditor/file/gutefuxotemowijozexulaxet.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210905/file/16308175429557.pdfIn PDF document text
    • http://baove24h.org/upload/files/83042629110.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/1378456221.pdfIn PDF document text
    • https://kaparatt.com/images/File/66410632363.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210921052950.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161328bdea6e69---wavunevemebalubugefowunu.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/koxunokaxexumenezamovo.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/kixole.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/72278644483.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/wuzepofugewamagofopix.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/95402043807.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/dazaramod.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/7n796g9n5866hmpjrbbkas7fv4/37589674523.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/4377921699.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/turuz.pdfIn PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/86400913921.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/55907958794.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/28866935933.pdfIn PDF document text
    • https://grnca.org/img/files/files/pelapirikuvofemodisuwise.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/84704285768.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/7728c515b04a4e883d1368f5b7bf4467/56526276004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=litmatch+party+chatPDF 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_off0000caa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA9 10140 bytes
SHA-256: 7f40aa7b68565fd4424f0b46a522008d57904c813dabc44e149c5541f86fdad3
font_01_sfnt_off0000e153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE153 17776 bytes
SHA-256: e0d29bb3b556e616a02c4944508bd49a779d4b4cd9d6cdedc0a9d0626af9fcdf
font_02_sfnt_off00010f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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