Malicious PDF — malware analysis report

Static analysis result for SHA-256 9251ac49e5b3590a…

MALICIOUS

PDF

72.3 KB Created: 2021-09-23 11:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d8518e60017613b6f528627427b12000 SHA-1: 5e325d2ac55fac7847f3d258fe18b2ce4ad126eb SHA-256: 9251ac49e5b3590ad4465e863b97b07731d4fa7535f848bbe89583d339d17832
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malware. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a phishing or malware distribution attempt.

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 http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c48e95bc8---89231784012.pdf In PDF document text
    • http://immobilieninvestors.net/userfiles/file/muwijimurog.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/xufuzuvedoni.pdfIn PDF document text
    • http://techmechengineers.com/uploads/1486449376.pdfIn PDF document text
    • http://jonellchem.com/upload/files/12638439486.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/pujuz.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/33408598931.pdfIn PDF document text
    • https://plasy.com/uploads/file/53757116985.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/69814862045.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/xavatelot.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/xazuzovati.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/88882875915.pdfIn PDF document text
    • http://webantikvarium.eu/tmp/2780699062.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/dubaxudulaxiwirifudikate.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/66198698934.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/59691154262.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142dbc8cda50---wagijapivosobuwatitukip.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/49540008948.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e78c2a6e7d6e693357dc88382fcc9c36/83832285783.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/baxabozizolisuxoverisow.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb510d374d---73637172944.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/92497609486.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/53060538920.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/bfa540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=simcity+unlimited+money+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_off0000b9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DA 10788 bytes
SHA-256: 2cb439d7ce51585ea4e7023bf988d28092fb33dc60f9620a8a6ef25a6a280759
font_01_sfnt_off0000d2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B7 16024 bytes
SHA-256: 675305e98af34dc3e819daabca62645c6977cb77f84c550a8880d7ef86fce1fc
font_02_sfnt_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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