Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a5d89e79193e0e…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 03:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8955ab9e14df294c768889a329f52a4a SHA-1: 8ea4565e41eecc4e472135a1eba096c541581db1 SHA-256: c7a5d89e79193e0e44366d531da914151a99161a73c7fbbd818cbba3aab98363
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to manipulate search engine results or direct users to malicious content. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for further exploitation. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • 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 http://criollo-cocoa.com/userfiles/file/zimoxoxulukip.pdf In PDF document text
    • http://mamitobe.ru/files/file/83926637571.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/44274691533.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/64067577647.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/walakabutikewadotofi.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/viruxutifopagage.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fexupude.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/57057171760.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/1cd5bcde9989b08a4e9bdfd629a5ca56/98945992541.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/35440543331.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/dunelazite.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/10013427306.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/65458075282.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/31798542401.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/99635901930.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/varuzomaxopomox.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/sopumamona.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/7bb0bea0f2158a5fc4dae40536037313/lotuvex.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/delikalurekekifiguzoxijo.pdfIn PDF document text
    • https://defi128.com/userfiles/files/farolinufegog.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/26379745462.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/gapimotisuwewax.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/vexifevagesatovuvapesewa.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/55833671245.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/ffdf5b3e7f87dfac4f4bc1ff4050902e/sajexutoduxarenurida.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161401bfd84ed9---13003931009.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/rijupusaziruvebuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+companion+device+manager+on+androidPDF 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_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 10976 bytes
SHA-256: 396cc3ef241bdc8c40530b9cd450e17902587c297618f1c45e550433ec1e8b29
font_01_sfnt_off0000f8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BE 18088 bytes
SHA-256: 6c30bd0d933f8cc0d635e6cc5064a43087e48ee93e0dda79e95686b222ff8b62

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