Malicious PDF — malware analysis report

Static analysis result for SHA-256 806940c380897115…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 04:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2344bf101b1e7fe3a1f070cacbd99b10 SHA-1: e99a569bf4aaf2ad85ad8ddfe89d11fea36ecc8d SHA-256: 806940c380897115b0152af62703a6cdf79bfa1a83982c69021ef0b967a808ac
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristics and URLs point to a link farm designed to lure users to potentially malicious sites.

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://psfund.org/public/uploads/files/cms_files/65128834741.pdf In PDF document text
    • http://seoulgreeter.com/userData/board/file/namugezovava.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/puruxejisopedufosa.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/0ainpbnkga77cosvvubukhp9ea/benitawuvakifopope.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/25885549494.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/sokatoluralu.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/54454012020.pdfIn PDF document text
    • http://chongros.com/userData/board/file/zenapijufigamufexep.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dadadb01106---kegevul.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1624853426.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/guvibulan.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/96157716271.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/292319461712.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/947a31338bcf8f2fa3ea35864245404f/kozapirozak.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/89228150039.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a14098495---39904733890.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/5bad17296ae27ea43139f8b42022b06a/vodezuguwijizulorevudatap.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/73875559240.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/f40sfbaoikmquqtj2omhtsapqb/20408782028.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/grfvljljshfodm9h3din1v63ju/3398626273.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202108210815048981.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/sn9avbhgd3080vfa459sou72l3/54535676780.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/potilow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=marketing+plan+pdf+journalPDF 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_off0000d1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BF 10820 bytes
SHA-256: 2a021373b4594f379ec4f904f7f995ec8b094297fa827d5ffa967257a19386d8
font_01_sfnt_off0000ea90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 16676 bytes
SHA-256: 5866072005bd557a926b0b02635c0529de1aac3e0c5736431a12822f046ac488
font_02_sfnt_off0001156c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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