Malicious PDF — malware analysis report

Static analysis result for SHA-256 225010933837d487…

MALICIOUS

PDF

88.7 KB Created: 2021-09-19 12:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1b0820ce779804de3265299cecefdc56 SHA-1: 659890f78261067ddf0d0df164072e3a85f4bc8d SHA-256: 225010933837d4870c8868e71ee6136b8510d64d4d9c1fd4b7826564038db6cd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=game+adventure+multiplayer+android PDF link annotation
    • http://dichvumucin.com/upload/ckupload/files/66636889681.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/ruxufuwofimitugo.pdfIn PDF document text
    • http://fitviewer.biz/files/file/liremawojajida.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/36211968719.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/89560775450.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/66481864319.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a36552823dcf39530282387937e237ac/tubojapoferele.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/58808880933.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/20380661765.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/tarivasejalepojagexeri.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/pivojaginu.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/29996703716.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/rujodusegiwuzotibulapajav.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/79758242179.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c432f5547d---winukiludesoxegulibiwokib.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/luvesunafigozoroji.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/88275844697.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16144ca92751a1---wijonub.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/mizobuta.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/65644864447.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/modapojafaxexagapezik.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/rolokavi.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/76488353781.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/64940378926.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_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11053 17096 bytes
SHA-256: 507744b4856316b0b86db5f9e23cfc2528deb22afa7d9ae38e64683a2a900123
font_02_sfnt_off00013c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C96 10704 bytes
SHA-256: c229908630f3b074db6ff9ad5cc07b7657cd8ed03fb5ddce3d4c109865d34d26