Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e373c834e189be5…

MALICIOUS

PDF

69.0 KB Created: 2021-09-20 06:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 42c23e0ce32439b243790200a8e447a0 SHA-1: 692f80083d258aefea8d1f981f10517272361bd7 SHA-256: 0e373c834e189be5257d09c46dd964eb5392518c16286a4c6632bf35c1436555
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely attempting to trick users into downloading further malicious content or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=backgammon+download+android PDF link annotation
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/54326336363.pdfIn PDF document text
    • http://jor-agric-aqua.com/user_img/files/46687523721.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364de83f8ed---1138892540.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/60896806511.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/92547291949.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///gugopogiwilapivibitalodem.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397def1551d---89819214617.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/40732777180.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/jofedixinobudili.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/72355201996.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/74146951295.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/48881711178.pdfIn PDF document text
    • http://keramann.ru/uploads/files/87353238292.pdfIn PDF document text
    • https://drgcode.managenet.ro/images/file/nujunima.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/7318921319.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/84547937521.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/vimuvidapasop.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/54645953337.pdfIn PDF document text
    • http://xhzhengli.com/upload/53806614422.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7880240ab7dba1434156224392c1b974/5832407594.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16141a4d3400a7---vaguxugeseridepuvudip.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/zixabok.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/56547868783.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_off0000b0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BB 10544 bytes
SHA-256: cd5b2a55b7b2b583600717356c006ac734cf707bb038418ed3a024fb29ad058c
font_02_sfnt_off0000e090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE090 14584 bytes
SHA-256: 0957436fe42141e740f285fd1bad9248b8b323f592b17174d365fa985fdcf28d