Malicious PDF — malware analysis report

Static analysis result for SHA-256 21dde2b22c582004…

MALICIOUS

PDF

91.4 KB Created: 2021-07-30 05:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 048858a6d38a134675d38c15cad7d7fc SHA-1: d0ce543e641c8aa09651e50acfe804a00e1353c5 SHA-256: 21dde2b22c582004e44282ff2c7c8357bc1395e90514aaffbedecb56ac6a08c0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=yuba+city+school+poem+summary PDF link annotation
    • https://clickkedai.com/userfiles/file/33079122812.pdfIn PDF document text
    • http://metallpress.ru/files/7602849885.pdfIn PDF document text
    • https://nadamasristorante.it/file/visoxikotokebupulituxuv.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/9f4a1f19f2ee01129a250734c69604a5/42836093386.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/69805283820.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/83037652017.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e0bd80918---76639855522.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/56182897356.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/70996250975.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5951b44e8---1376123887.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc3ce8e5ec---66987627912.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0021a77ec---66462724955.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbd56dfe0c---bazusuwaxosobipe.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6a18c6d90---64859383984.pdfIn PDF document text
    • http://vodnik48.ru/content/file/4464237544.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607926bee9d20---buxojugapimu.pdfPDF link annotation
    • https://dynasty888.com/image/files/20210623_002252.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf8b3a7d3a---32264602603.pdfIn PDF document text
    • https://www.upperhousedev7.com/ckfinder/userfiles/files/83172138173.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/43n528c134hur7d8vambtu00f0/21021951503.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/ruvalefosamizame.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d404b4fe66c90f56477f83a8ade33f95/lefuvida.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/sofiviwigigatebukizumep.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/zonutipuvivigomofi.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/n4rpf1qopvgdvv1ppvflbou1im/dalabimamunun.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/50240879595.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_off0001021f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 10872 bytes
SHA-256: 87c2aef2ee07bc0853ee7cb1c98342ae62bd86a8613f300319c46208b7d2418d
font_01_sfnt_off00011b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0D 17168 bytes
SHA-256: bcfb148391e1fb5bce8b0317cd1a31b771a30452632ae512cd9a744f8826b00b
font_02_sfnt_off000147c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1