Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1941d6cc14cc57a…

MALICIOUS

PDF

88.4 KB Created: 2021-07-06 04:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40d8bb45bdddd620f57866204a709f04 SHA-1: 383b55d568144726e791ed47f18badadd94e6659 SHA-256: c1941d6cc14cc57afad13041bfd50c89fba51c0beca4e203e3ed6c8344e406e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript (T1059.007) and the nature of the links suggest a phishing or malware delivery attempt, consistent with Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/dc916323f3782468e7d4600f497c7cbb/kilejoxikelonobixota.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae96daad339---93020300749.pdf
    • https://cottingham-group.com/cufiles/files/fozute.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dbfa4ad9b---lusorebotub.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/574d21018eb46996e69ad37ce9410abc/5869133212.pdf
    • http://quimis.net/js/ckfinder/userfiles/files/32621787109.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/aqeubrnoko9bi6bf3h0jkbf9m2/28897377766.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/d0c3c4fc0a60d4bb43e13b004149a108/84427969399.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c1a35eed---maxemafifiranasowetoxatok.pdf
    • https://chp-travel.ir/data/file/lalatekivinajumesa.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/61166497680.pdf
    • http://aktifimmo.lu/userfiles/files/41431686426.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebf0aa3e26---41458032579.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/bb5bbedd7e406df25a9b4b39bce57f59/84480283705.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/qtg1p4v5fgal1eplflm9b1o40a/basikigukofirililele.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd47b0de5a---nubabo.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75668855f0---wulisirozelo.pdf
    • http://russia-ex.com/loruxotuvin.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb526b9fdb3---dojodi.pdf
    • https://rmp-familienanzeigen.de/cms/files/66293675618.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/5a9e7c2c786eb28a3757934422412d56/98254136054.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6c114a87b775f396a76f4c7cc122a1df/depagufubipof.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/0mv3rk45r2rhes3g8av2d78es5/78904034608.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086c55737d7d---94547727860.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ff7fc0aa8---fojorezarosavosisotuwuza.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/41706f3c721d8683be9b56e84cda9db2/devinuzodidepe.pdf
    • http://dioceseofniranam.org/userfiles/file/68405601320.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=my+mother%27s+castle
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 16792 bytes
font_01_sfnt_off000102b0.bin
a090d2a397c8006ad9175c087a5f18b01b4a789549c0a5e51a6a75a770627b2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x102B0 22136 bytes
font_02_sfnt_off00013a77.bin
1d5c1b9c7293e02718da3b674a45ae27a3c863f33f598a20876be6bd4c9af256
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A77 10440 bytes