Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ca2ef411595653…

MALICIOUS

PDF

82.4 KB Created: 2021-08-16 18:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 092f95c63e9dae0ade9a9ebf471cf434 SHA-1: 4923d01c012f9cb8512c5efd0c4449e5c9dec5b9 SHA-256: f7ca2ef4115956530b88865a3d7d59940d4bd3504fcdb14cb7e595716421df73
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.afoa.org.ar/backend/ckfinder/userfiles/files/paminifufaf.pdf In PDF document text
    • http://wingmanresearch.com/userfiles/files/68496006995.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/90769749514.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/kog7qgbk483448no22rllbe502/farexa.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a443616591---judedokotetiboranik.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/zubapuxepifaxozewef.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6760b0e905---vinitawemudalenejarafake.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/spt9jidlq3jf1jjs33kupsk2st/zogojefigixozinoni.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2105021841053096944r4s3g.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/1ar4u35djhp2slu77ap1r22fhi/wipanusifixowugokeju.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabea1251ff---sasopudalop.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/tugiker.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/917098bbe7969ac2ece109b1a0fd1bf2/kagazavasowijutezede.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/11671138066.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/rigimuzulebozumofemavo.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f15c1cabed---fakimosudotokij.pdfIn PDF document text
    • https://noddy.nu/images/file/ripivivifarub.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a1f7b578f26ccc68f7a230b76832f955/59722175491.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/10580124297.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/pasikabo.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/sli07kh4jcflqj01itdt3nt9e6/sewagixupudutap.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/20369246966.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/leef4fhg6kjb1hssfbsmhc25ed/82920090538.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b0f80263f---fovilojatugipiwida.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f033c2eafaf0b386ba5d016f0c5c1311/95104468758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=download+mini+world+block+art+mod+apk+terbaruPDF 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_off0000ddb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 10924 bytes
SHA-256: 296fc0058dce1b46d9d3c6046912c6ebecf36648d09c52e0d0700bf31b6cb831
font_01_sfnt_off0000f6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED7 17232 bytes
SHA-256: a6752151d46e4ef98dbb8256b90d63901333d4d6321057b516539d77c23176df