Malicious PDF — malware analysis report

Static analysis result for SHA-256 0492a47b55201ef5…

MALICIOUS

PDF

83.2 KB Created: 2021-10-07 12:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a695d1c6b66ec6a12089b009ff880bd0 SHA-1: 979da32d07f1ce0c76c023f3d6970ad2598a5665 SHA-256: 0492a47b55201ef58004fa4af752a768b2c1e74a08c3421b2f214c2e7146d3c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/cq4rjpnedi77u1a79cvhs3p643/limasani.pdf In PDF document text
    • http://les-dvorik.ru/userfiles/file/gisubux.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/xotopigaf.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/61796154401.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/famevunozuvubuni.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/798235279.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1615906482302f---pogazatajiwixopodeno.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/83132332086.pdfIn PDF document text
    • http://asja.ua/userfiles/file/tusinupimuzaxuguzufejoz.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf51f02fe---merilafajoneborarawoxifin.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/gizudigozekupekilopeg.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c2c7040997ebd0f752d4f02a9e9527ce/texesov.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/66104337758.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9a07b771a---giwopakawifesi.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/sonerifa.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cce2fddadd---41036333467.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/69842206140.pdfIn PDF document text
    • https://arranridingclub.com/fwd_docs/file/64711385223.pdfIn PDF document text
    • http://ndfeef.com/radiant/mechimobiles/userfiles/files/67478612408.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/91447813873.pdfIn PDF document text
    • http://www.bash.cl/media/file/demovokipexofowifuja.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/41860871149.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/bugogerinitejus.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/remoganobatekojabono.pdfIn PDF document text
    • http://imbirimbir.ru/files/25459315523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=no+man+is+an+island+entire+of+itself+every+man+is+a+piece+of+the+continent+a+part+of+the+mainPDF 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_off0000dad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 19272 bytes
SHA-256: 134022ee165a7c5278d966524dc3a1ffcef9d928b2fc1b9b9fb007766c29a465
font_02_sfnt_off00012495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12495 11044 bytes
SHA-256: 6f45dc6b7a45f5ce2080962ee68b30e3b729380a7740506686140ba8f9829f42