Malicious PDF — malware analysis report

Static analysis result for SHA-256 45aa51bd24c72e33…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 00:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 04b10eda2d0e571edafeb4e244f951b1 SHA-1: 28d84ba3a1c8e5ff9ca11a77517444ee55cc0480 SHA-256: 45aa51bd24c72e3306737078b26e3bc1e648d046726c55fab3edfa3854b1041e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised or disposable domains, likely to lure users into phishing sites or download further malware. The PDF structure itself does not contain readable content, but the heuristic firings strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://sntaviator.ru/ckfinder/userfiles/files/27803786950.pdf In PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/928e853ef6777270c65d6e4396cf2237/mijured.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/70777444189.pdfIn PDF document text
    • https://suruburi.net/mm/file/zasaxisi.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/dakesufajurima.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/napinuzezapowuxof.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/c2c89603cb2505f47f8ee0d341b58ff7/37619077049.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/54680205209.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/758ed3eed3faef8a6be1d8f3351f4eec/jekejidigexunajunetukomu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a5ece493a---86374707677.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f134100aa6---moxodadepiw.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/74277953673.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/23n7e42r781uamjets0s5dr5cr/wuwivaremerutevewixomobol.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dac375dda4---87583352990.pdfIn PDF document text
    • http://unibox.lv/files/text/xaparegivugumilibasuv.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/65025082420.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608e69deb560a---fojisirigumudepifozis.pdfIn PDF document text
    • http://bamor.org/userfiles/file/jejirulonowi.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210616_EC873E2DF656B0D2.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b11450a74bf---direnixap.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/66c3c3eedc66632e02cf8b38b72398e2/rivutekeve.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c74911a189---64762176283.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/99926495572.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/49210991269.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/72057ec8bdf86649c17c549ed64ce803/62571280118.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee9e8387ce---kataremapojapigaz.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/d29d29b4c3adee5a494d66e4d61bb98f/mabijelupotovalevaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=clinical+neurodynamics+pdfPDF 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_off0000c1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F9 16500 bytes
SHA-256: 81331165796348a3d531f8f214d5ff7903337c1a5af5419d2019852501ea31a7
font_01_sfnt_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 10928 bytes
SHA-256: 58c6d86a2525c9cec309647da1263a55c36dd06ab524a8fe5a4d7ca51641d6f6
font_02_sfnt_off000105bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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