Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1aa157528d641b8…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 21:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d139084f27c724ac55248822da706bed SHA-1: 34ec82d39d654b294aac37c52d70367114f988ed SHA-256: a1aa157528d641b8d0e1033cd54fc40b7d46964cd02acd0366ea0c9ee56a75ae
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a remote-support tool lure. It contains numerous links to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content or downloads. The document body is heavily obfuscated, but the heuristics indicate a lure for remote support tools, which is a high-risk tactic in unsolicited documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nikkenj.com/userfiles/file/zazarejafikivosi.pdf In PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/jasidejizag.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/wasabate.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/90328427405.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/81624802164.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/gigawi.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/fuwizasikerefilerobeleleg.pdfIn PDF document text
    • https://keongracun.org/contents/files/18350497222.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/wukevor.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/zozotiseluf.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161329f15e1208---nimewesamafetixilesa.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/72838883847.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/zojoxefetetobep.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141ad1d14460---dekosamanado.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210908165944_dd5rae.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134886b1c85f---xiweziruwipa.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/df85df2f1427945dcdf4aed41897aece/vozixel.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/pedalu.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/37573199982.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/pedunabopukodulu.pdfIn PDF document text
    • http://beta-rc.com/upload/files/ravaduk.pdfIn PDF document text
    • http://atek-ent.com/upload/file/97144793475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=apple+wallpaper+hd+download+for+android+mobilePDF 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_off0000daf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30D 10704 bytes
SHA-256: 9d1ce478544c3e9bf16b038e4d714c1efae382690ccd691ee433acc8b2d65081
font_02_sfnt_off00010b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2D 18208 bytes
SHA-256: a15cc2f03ebf28d5a52b8c00eba6b7f68d1060bb6daf94e245e0d8acb3c8b0bf

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