Malicious PDF — malware analysis report

Static analysis result for SHA-256 666f538a601b54b8…

MALICIOUS

PDF

93.8 KB Created: 2021-09-04 09:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 88d88dc0e32cfb4fff51022eea245cc7 SHA-1: 69d400a2969d7a25c333565a9410a5d1b7cd8702 SHA-256: 666f538a601b54b8345893ba0b47e0db3e21b20558bedfcad24b44f9612e2fd8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://philabc.ru/uplcv?utm_term=solid+waste+management+pdf+thesis PDF link annotation
    • http://oilandgaswork.com/userfiles/file/78883207773.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/da448003f4c7d64915f04cae12fe9cab/vuwapo.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/kexujomimilusupifu.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/derugexetanuvijabuvepavag.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b25956553ac---33408265472.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d1debcd85df---jojobiwivofoguloridedam.pdfIn PDF document text
    • http://12shio5.com/contents//files/72942488094.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/vufobuwoxozokekas.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/sofato.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/80894680944.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/wofajofazukepofotimifezaz.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f7479f41---33635594994.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/sikuke.pdfIn PDF document text
    • https://siroyensao.com/upload/files/jerososarije.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/74402756737.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a2c74c83---94593894617.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/83799122349.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/79947465761.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c07e5e11fe74f2c66100692741974119/36887236764.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/lalixuzafujesizam.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/gotijuvematibo.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f58b68e551---97622775591.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae2fc9b2b---82850918153.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_off000103c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE0 11008 bytes
SHA-256: 2fde2dbe7921659df49aeea76cbe5c056029913f5e0af597ebd69179b5cb051f
font_02_sfnt_off0001350c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350C 20880 bytes
SHA-256: daa5d0241a843fcce98035faac157c70e10b7c22686dce2855591504ddf58f36

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