Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80382410d27bc5f…

MALICIOUS

PDF

79.3 KB Created: 2021-09-08 10:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b14df7d204a2a09c5f0767c1fa65506a SHA-1: 888106319efaff3b7edf32a67c018e3e6573eabb SHA-256: a80382410d27bc5f81606202a5ecfb640995b64da3e49a09bb5c4f61571d43aa
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure suggests the PDF's primary purpose is to redirect users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://landbondcorten.com/attachment/file/7ae7fb3e0e6c0425d7003f4ba9f8dff4.pdf In PDF document text
    • http://ufnk.fr/app/webroot/files/file/balorib.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/4074da17ad1c16ca1137a8612f0b8461/levijikakepavu.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16098af4bd0c16---37419652787.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/gugatiki.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91131922900.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/83003090570.pdfIn PDF document text
    • http://foxadv.net/file/67117902170.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/85650602322.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210805044454_iwpv4b.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/d6dbd36e7737f242948854eafeb91a9a/vozarepepu.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/depusisojesota.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/jimubadinulujilusavagujup.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/welopivoxali.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/kizatizexesoliniwofafo.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/85713692112.pdfIn PDF document text
    • http://unibox.lv/files/text/fuvugugememowaz.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/4687366041.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/godot.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ffe6e796e8ec98f3a1a8ac8a904a816a/wolebilukafopo.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052107572870554.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210824100021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=preventive+and+social+medicine+k+park+pdf+free+downloadPDF 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_off0000d024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD024 17704 bytes
SHA-256: 90b8e807e27428390286c77ad4552858b28d95fedf1f46a0bd7a7d58aff67e78
font_01_sfnt_off0000fdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001160b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160B 11028 bytes
SHA-256: c2a352bc08c1216b7e7febee657028f47b13fe1f14834cd4ec98195196bc5be7

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