Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e3dd8938c3bb87…

MALICIOUS

PDF

110.9 KB Created: 2021-06-29 13:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de69c305df536b97ea075da579e9a47d SHA-1: 0226e11baa6085c9008c7b45f315479e1ba17e7b SHA-256: f7e3dd8938c3bb872ec1605dc3df14c7325924e82ac814ea0c65b8c3139640c8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://izumrud38.com/ckfinder/userfiles/files/64184752209.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210613231320.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edeb779df7---93053323942.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/9966787e6bd3f8bd299b2e82e10dcfa5/timiziler.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c214014f---201103454.pdf
    • http://debten.net/UserFiles/File/xunobutopugebelivomep.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cab7de5942---86651465693.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b23a3bdcae6---zoduvevewotineluwinuv.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/79042303294.pdf
    • http://dtcguild.org/clients/80367/File/89258634729.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d352aee3735---41701007001.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901582622a7---mokasajetune.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160842f98d324d---dagararuxidoguto.pdf
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59099435722.pdf
    • http://policylic.com/uploads/files/88620784165.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/8ht166j6dcohkunek6ldtel5u5/ludiripinowibisilez.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/fakanibojutikoru.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4f9dae089---susetekavopow.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099d10be8907---sujofowodex.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d88177f39---79454495595.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d947e5c5a3c---59327428255.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/oj5tfe63h1usf59dvpsffeon62/loguxup.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4843a11ac2---rojiripejesudutodesafu.pdf
    • https://rtvpuls.com/ckfinder/userfiles/files/mosekunizidasoj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=manic+anxiety+episode
    • 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_off00014c62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C62 16792 bytes
font_01_sfnt_off00016474.bin
697c8dc36521064981bc7798b5e70c2d95c2480ee636b6b07dc645cc8cf761dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16474 19352 bytes
font_02_sfnt_off0001967f.bin
73a4bd4c070de186e67b345d2b7d6599ce6b23ecccebf5a493ba30db3d2e8a35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1967F 10568 bytes

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