Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b56def524a5ac39…

MALICIOUS

PDF

76.1 KB Created: 2021-09-14 07:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 15ced524148b43d3a8a1bbf7baaa22c7 SHA-1: d47d278610a62df5ee842364755836a1a8d92d07 SHA-256: 6b56def524a5ac39f2e919e6d4015d89646ce08c0e2e8e3d4bce0902baf24a2c
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document's content, though heavily obfuscated in the provided excerpt, is associated with a 'Remote-support tool lure' heuristic, suggesting it aims to trick users into installing such software. The numerous embedded URLs, many pointing to compromised WordPress sites, likely serve as download locations for malicious payloads or further phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d1bd3b309---29379758426.pdf In PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/febekunokigox.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/78898981154.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/mitifazevukelolutol.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/kakugoz.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/sunujemaxujevologes.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad809ddc97---tomitisotag.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5d9889ee7---sasavezilib.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/54072999294.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355ae241c53---84195225380.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/92522683323.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/dunamimugijekinidub.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/zonimidowigesopoka.pdfIn PDF document text
    • http://frchem.cn/upload/files/memelawabozuvopotex.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/tegedubitibetapo.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/ravulusulowi.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d5030aea1---32691157203.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/pikewasagof.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/mekumasuzopanedewuxapavu.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/jisamepavok.pdfIn PDF document text
    • http://domario.ru/userfiles/file/kosotexewurewetanexo.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/81253137239.pdfIn PDF document text
    • https://raljob.com/userfiles/file/84182304955.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/wodaredimetozuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=bluetooth+remote+pc+apkPDF 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_off0000c8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BF 10520 bytes
SHA-256: 83963b8454cc0e7301daa86cd464929ab66ae3be64128b216ff31463103dacdc
font_01_sfnt_off0000e0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DB 16468 bytes
SHA-256: cf9ac9d0d32fec7443c250c09a3a91ba5ae7465f2614a7690356a2aab5bacef9

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