Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda90433bdbe06f3…

MALICIOUS

PDF

91.4 KB Created: 2021-08-08 15:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a1dadb2e3873dc0559a4c6150a11cb5 SHA-1: 8efe9b7a3235713ff1238b31a9218071c479d3cf SHA-256: eda90433bdbe06f35b7bafc0422d792f1fc46051fc38813c980c282d1c4c2aa2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests the document is part of a link farm designed to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://krisoc.ru/uplcv?utm_term=easycap+usb+video+capture+driver+windows+10 PDF link annotation
    • http://srividyaastrology.com/userfiles/file/nubolutenuwupu.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/wiruwen.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/84217141603.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/7936f808cc33791bc4bdd6cc9877a5a4/97619824129.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ac6b41e8---25158752951.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/manazov.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/66702872424.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/zovogaxebuzokibivuxega.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/pomoxetegatavavaloj.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/94080806785.pdfIn PDF document text
    • http://wych123.com/upload/files/mirepexoruzewa.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1f7dad648---44068726998.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c930bd76876020327eab8c2d1ba8b81f/kodalep.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/fekuludofexiruxotupulewuk.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebcb1c41ef---wuzarex.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/32022064905.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe6647d9a7---zabiruxufituluronip.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0f7f3995015bd249014f0ffe4f4b14ab/bojukufuritovinul.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/kevesupefi.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/vajibi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/fc893dd4b181f47131be8c1358a2c624/fimupipugojikesarujup.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/7992586801.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/25747244667.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/gunexurej.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/fb62aade0fd265bac654facb62707c28/46870540536.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_off0000f856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF856 11124 bytes
SHA-256: 267f7ce15d66835fd239c846dca72bf82c74a1f293ea750d8ab9cc7caae1d2df
font_01_sfnt_off00011257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11257 20508 bytes
SHA-256: fa0de59df0f10cde6a5aed78e9784f960f209cccacae94f0838175cdf7631a27
font_02_sfnt_off00014720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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