Malicious PDF — malware analysis report

Static analysis result for SHA-256 0366281b204bca7e…

MALICIOUS

PDF

87.0 KB Created: 2021-08-09 20:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d6c5b5d8c1782b92bbfaddad014b831c SHA-1: defc062cd417e66e5e72f48da9f4c1378e3a05f2 SHA-256: 0366281b204bca7e12f2a8d2116e861e83fbd0443a325672283cd45a976bc910
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains embedded JavaScript and numerous external links, many of which point to further PDF files hosted on compromised websites. The presence of a visual download button suggests a lure to trick users into executing malicious content. The ML classifier strongly indicates malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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://oniceh.ru/uplcv?utm_term=purpose+driven+church+rick+warren+pdf+free+download PDF link annotation
    • http://alhs1973.com/clients/64426/File/forisawari.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/68421615813.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/eaab0ccaade1d04228d04c9eb27eea45/25281170530.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/9af92be07dad23cf4184e9b4616044da/36901509776.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/setemipatatatu.pdfIn PDF document text
    • https://mmszke.hu/files/file/mowivofonejipowoz.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/52858081783.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f494c6b17---vefinudetuven.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/c60d0b721bec97c1fdd3710aba7e5076/xunumetarusetuxuzoxi.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f10728a01d---nabofasewonav.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/91443d7898918bf178a13606882615b0/88841616244.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36d376855---42275769557.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab458bc6b77---43935418727.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5657f2086---22176370513.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/bedemenemip.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/segozu.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/82027905137.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/25826747847.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926da9906e7---58632885572.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/vumoz.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/20804596800.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/bimuturifixafawiji.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/3217899837.pdfIn PDF document text
    • http://rts-3.ru/upload/files/10310345872.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/24199939848.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5f5440586---90035498366.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210801_2B61B4ECF5A9F5F3.pdfIn PDF document text
    • 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_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 18788 bytes
SHA-256: 8ff6aedf6d03bcade5180fac55e148417d535958fb822c2d9390d37e4fe0692c
font_01_sfnt_off00011b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001334d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334D 10964 bytes
SHA-256: 580cb921ba12d72453d44fb0118a2edbec33fe32ce8f17f5f6c26186ac0e2708

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