Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b687a7cad3bf85…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 10:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 54e801d407f78327a65fc237896c47f2 SHA-1: bf1d21da61b72e56951a269cf9b083e14608c802 SHA-256: e0b687a7cad3bf85ab7de24971862119a9318b7755b349d2ed4dfc341cdce905
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are likely compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of multiple external URIs and a link farm heuristic confirms the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://guchen.ru/d/files/57382329380.pdf In PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/ketunafiw.pdfIn PDF document text
    • https://kawanmto.net/contents/files/vijab.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/62889382616.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/dujotewatidowudurezaze.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/nodowemigurirasamami.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/9ba18a71b39e26c91b3f5e46dd7a899a/13128573951.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/55614477185.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/93414262179.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/96374629803.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/wobomojalifirelewedon.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/patumutonimavokemuzo.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/89887662393.pdfIn PDF document text
    • http://telecycling.org/files/file/vajagajigakodi.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/doliberatenipopadel.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc4c292308---85222411943.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/89292311919.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/70338423135.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e50871c70f---6755797808.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109151548365888.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/60163214733.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/56155506955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=jurassic+park+builder+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_off0000daa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 10508 bytes
SHA-256: d2d51b99fe83ca0cbd52ed1bad36df02dd08224e4df327e4ffc7e26bb1c16b09
font_02_sfnt_off00010a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7E 19324 bytes
SHA-256: 2800630c7e13fdff57db779ea18c4ce0c0d5df826a69ab6038f9db426d65eba1