Malicious PDF — malware analysis report

Static analysis result for SHA-256 1105d040e9140c4f…

MALICIOUS

PDF

86.6 KB Created: 2021-08-25 21:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0adf4fc2a54f7adc4a9dd1b0da0f9b42 SHA-1: 1eb20871b1e7229744c3a47946a1953ab94868e9 SHA-256: 1105d040e9140c4f2afe427dcf255aef6ca1448c3aea9ef4d4124c00e6caada4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document body is heavily obfuscated and unreadable, but the presence of numerous links suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://hyundainhapkhau.vn/upload/files/54282329107.pdf In PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1611b4ec24d85b---87242679080.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/ladosimifa.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/zebawaduneju.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/57471594973.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/binejonakagamiw.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/nedubu.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/sotinagobokiga.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/62755266802.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210729_014207.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/86902969937.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/jp95dl91rf87s7foua1dc7eh15/vabinivigirapaza.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/830fb8f7d947282afc6aa4c877dad01b/64901550286.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b8ea140354d5c3025266f8521e480733/xifadegu.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/rabezadopuwo.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/14865016200.pdfIn PDF document text
    • http://gyobel.itpublic/file/kijoleropojejowerisisif.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ec539d04856---linozul.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/funifer.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/83983423956.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/10814875502.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/vegadodukosuzaresuvi.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/nugusukerid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=star+wars+rpg+force+and+destiny+pdfPDF 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_off0000ed79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 17060 bytes
SHA-256: 5752e852d61a2ebfc9281b3901ca2505670337b01bcf6f993bedc1b041abaf54
font_01_sfnt_off000119f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F0 11024 bytes
SHA-256: 6a51ec50525f8f970c1ce99253fc909b4d97f377cbb48dac6d052bd004d993c9
font_02_sfnt_off0001338e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1