Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c55faeafacbefb5…

MALICIOUS

PDF

88.1 KB Created: 2021-08-03 23:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f46f8d8da40d43cf1df441b47cb482c1 SHA-1: de48e26a08d52ff4e5ddffa05f3a863982bc1d94 SHA-256: 1c55faeafacbefb55aa452deb10dddbb5c22245a3cfc0991bd017ba26338ad13
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, some pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious content or facilitate further compromise. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://sjalikave.hu/pictures/file/61076008374.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607495cba17a5---nemogikulusov.pdf
    • https://xanbiente.de/userfiles/file/74880458742.pdf
    • http://lacasedescaraibes.fr/file/wujabakekafubijek.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/cf0350b18bbe8c6ed6b06af0ccd3a6aa/waganunomipad.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/79587948560af657774c2a.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b7758867f9bebd3f685c2bc5189b7363/86151040214.pdf
    • http://ed-web.cz/userfilesfile/puwalot.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb8ef78dd9---rewinabuzuxagukem.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/83839034781.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bbb8cca69---dinudus.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/9fdf01d6ab2901bfd1d613a56eb1ea59/fexolidoparozoxi.pdf
    • http://alhouti.com/userfiles/file/1245550690.pdf
    • https://nonbodepsg.com/uploads/files/sedisuzevuwe.pdf
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/tanufubogimid.pdf
    • http://baheth24aqari.com/ckfinder/userfiles/files/nilawokelagosexomir.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/d8b07bb648c031dfe6eadac56a9c46bf/11670122772.pdf
    • http://chronocertif.com/userfiles/file/xawaxetakimubikirever.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/0t9gml0hc7m7f22jjmkjbe0fp7/setoxijutituz.pdf
    • http://efuturesthai.com/uploads/file/vixezofipazemijegadolip.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa5cd8b5c8---vadukadizimuvaf.pdf
    • http://ghioroiu.ro/sites/default/files/file/rumad.pdf
    • http://teenmag.cz/userfiles/file/kotomasogimuwaro.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bartender+7.75+crack+free+download
    • 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_off0000f27f.bin
bc57c527c310c3a61ceef299b3ee1f19364a2bc1c40aee43d86ae6001598835a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 10692 bytes
font_01_sfnt_off00010b5f.bin
a63a382dbfd9af15af5cc7cc9a0e14619b1f4aefdcbda85ef47e8c8026a71c1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5F 17476 bytes
font_02_sfnt_off0001394b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1394B 16792 bytes