Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1807f0826a569cd…

MALICIOUS

PDF

88.5 KB Created: 2021-09-24 01:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c02908b4f0f5692c59eb3abb8e741836 SHA-1: a9c972ea3a4e81d747bd05ef892c049c3bcb8107 SHA-256: a1807f0826a569cd138f6f778e4eb41aa8cc9c44845a5e91a1f802ae8fe949bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which are part of link farms hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' parameters in some URLs further supports the idea of tracking user engagement with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://huntic.ru/uplcv?utm_term=private+dialer+apk PDF link annotation
    • http://steffis-strassladen.de/userfiles/file/37571786534.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/47528672641.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/tagotadejevuputazozila.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021092304313236.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/71896545294.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161435a9528e8c---sujowatofojefigex.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16137170f2ac6f---55444799080.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68582538379.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/19365021784.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135b4c4939d4---vunemudun.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/tapazuniwulopudamamowulo.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/muzusanusazasusanuzubefe.pdfIn PDF document text
    • http://reflita.lt/uploads/files/95600586510.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/92679404561.pdfIn PDF document text
    • https://siroyensao.com/upload/files/bemojulap.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/16883729189.pdfIn PDF document text
    • http://afslab.asia/upload/files/kikileludo.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/30226749655.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613084431c870---sotoninaxifat.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/14090849982.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613394b62e63a---merisuzedobezuf.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 18432 bytes
SHA-256: 2f6397910820f26d1b440c342844d906695731496128defce90a271058a757aa
font_02_sfnt_off000124dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DD 16540 bytes
SHA-256: e8486dda68d8266c598e955260788762e21e39567fd64c38d8391f70685452e0
font_03_sfnt_off00013c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C09 10152 bytes
SHA-256: 428001ed41ae43d2a5c8b5361b7a3ffbdd26f1d9c45f5dcfd3edac2eb78ecfb9

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