Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c2f529385db1c83…

MALICIOUS

PDF

91.5 KB Created: 2021-08-12 08:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 27c16f7c9c6b8ad950af6a11b9bdaf1b SHA-1: 6993f0c396287845928d77977ac4e01944e3692f SHA-256: 3c2f529385db1c830fd4a0bf3d8183b4860552cc7c3ef6e6ca53b0ca307bf8a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious PDF files hosted on disposable domains or compromised CMS uploads. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://dokturmice.com/ckfinder/userfiles/files/2339509164.pdf In PDF document text
    • https://die-elke.de/cms/elke_page_files/file/setupojutaxotowo.pdfIn PDF document text
    • https://giustofiori.it/file/43612542170.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a375a96b62e---3928818770.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc3dc67e90---suzexepobuxigonabe.pdfIn PDF document text
    • http://domosplast.hu/files/file/30962289476.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/95554757916.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/fb570832b596b7294fac63f097ba6fec/gamokububokema.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/93872120131.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/83231410ed550a9cb6b38b001b4d672e/63084749877.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd7bd61165---75638864300.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/6053dc99d23462bdf68c5f03099b1856/vorarozivu.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/20148457252.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/venomupejimo.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/5012870177.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/6231568ae3dbb0f57e9b53c0709256dc/92014405695.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/0c0dc3c42a7780122cbd0bfd0b019d40/wimezotu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a0127c614---somovotikalesudidakekiz.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/deg9f68295ohqu78f2t071ie4f/xalolikajilukidigodijika.pdfIn PDF document text
    • http://ocean-ex.com/images/blog//file/gobirolunege.pdfIn PDF document text
    • https://schmitz.cz/res/file/xedom.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/betewaronolemupajij.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/95438356588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tai+hack+ngoc+rong+javaPDF 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_off0000eda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 32032 bytes
SHA-256: 941d77994d68b41c5d3506d3e4dccf91ca07c04d4b338afe8b35f0473103cdd5
font_02_sfnt_off000146e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E5 10316 bytes
SHA-256: 8b13af61bf64ca15df83c467086b5c1a04dbaa532aa0b174ff2170abc5f7d581

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