Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa56f3300cb1d1b5…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 19:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aee1682b7203d93d441aea89ad12a019 SHA-1: 7561894ea82618d9c3844063901487f6b4a899b9 SHA-256: aa56f3300cb1d1b53ed39c0ae487f7ad8d66bb06f8e4e6ad8a9e0c0c7b3c06e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm pointing to potentially malicious or compromised websites. Heuristics indicate it's designed to host numerous links, likely for phishing or distributing further malware. The ML classifier and ClamAV detection strongly suggest malicious intent.

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
  • 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 https://motelandratecuci.ro/userfiles/file/76881022869.pdf In PDF document text
    • http://prime-standard.com/piceditor/file/ninife.pdfIn PDF document text
    • http://conroeclassof72.com/clients/d/de/de0acc14889d5d69ce6a2e221f3e79cd/File/wadev.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/16797580586.pdfIn PDF document text
    • http://jpmoto.biz/upload_picture/54141779198.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/funekibafavujawow.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/rajurax.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/dabexejuteweda.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/41515936407.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/kepebifamezoniso.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/901uqja2ej68rrl4o6ucsmvrb8/fufowotopemelibibu.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/5354fabc2a846a9335190d27243bac9d/69022308542.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/sunevulivuwidupipot.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/59344618328.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65fa064509---fumipufizetujafuj.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/ralomedabe.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2108111704172893341vpr8z.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/mobozozemerilidupin.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/kabebuxomirinomekokapiw.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/82998f0622744533698fa06f0f908df9/zelulominoxezinopojak.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/rawetudovu.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/10824815835.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210818_045807_2161.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202108291729096847.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/lexesevejum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=microbiologia+veterinaria+pdf+gratisPDF 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_off0000d745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD745 19712 bytes
SHA-256: 75abe483b4916daef2ee1fa376fa1314fe281eb6c22bcaf5f7e616f73e508b37
font_01_sfnt_off00010b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B44 10992 bytes
SHA-256: cd1b71ab1abb369c590a6e4b4ca9d735b9115a0d98ab43caf7c80b8e6e6e6371
font_02_sfnt_off00012490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1