Malicious PDF — malware analysis report

Static analysis result for SHA-256 679862b5d592e866…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 09:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6e52f4e6c8460a3da6d64e7cced6eed9 SHA-1: f84284f14d27e49e145b10aab9799c0d2faf2d8c SHA-256: 679862b5d592e866069edec2c2df7c736c3f03a6b5ea9fb22e4f7c5e32fef433
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a malicious document, including malformed streams and a high ML classifier score. It contains a link farm pointing to numerous PDF files hosted on various domains, some of which are identified as compromised CMS uploads. The primary goal appears to be directing users to these external links, likely to download further malicious content or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://agierresrl.it/userfiles/files/somaselokixelami.pdf In PDF document text
    • https://mbbs.hr/files/niwevanetu.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/fijodozakujizatarizupo.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15368582571.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/33366331865.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8d24867c103b21da4e6b770fc8e6f29f/kikat.pdfIn PDF document text
    • https://kimcert.net/E/file/belotuxoxobo.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/59245086682.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613291421126a---43405632303.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/16855173073.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/89250437934.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/42831038233.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/21912037416.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/voruxajetujubapu.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/99005487994.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/90344201628.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/c69d69b28d6b84559552bbfee80cdf2e/91893133631.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/guluwurakopikusu.pdfIn PDF document text
    • http://acril.ru/ufiles/files/17175652135.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/bekovikipubemebugareju.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300970397e2---4514211591.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/kavifanazarapawivekab.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/41144999046.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/76273930602.pdfIn PDF document text
    • https://bczenekar.hu/files/file/50059317203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sreekaram+full+movie+download+movierulzPDF 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_off0000dec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC3 10728 bytes
SHA-256: a14dafa40619008a9357c29d4654991567b48fd0fe5e9acff6a379967f3a6d80
font_01_sfnt_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 17688 bytes
SHA-256: ff6612dbf5c731a3759178fe6ef5e2b23e2b93b89f7d1b3d74ff87918718742d
font_02_sfnt_off0001259d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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