Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99db9792703b5f6…

MALICIOUS

PDF

85.7 KB Created: 2021-08-04 20:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 11cf1d868b9ac6ebc2b01c62f22d7d6a SHA-1: f08a6c856c8b742c99593a1ff660c5748bae75d1 SHA-256: f99db9792703b5f6725a3c4cab9ca96e0a2ba5028a1851ff6ed8249f5d1ebf70
204 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and numerous links pointing to potentially malicious content. The links are distributed across compromised WordPress uploads and disposable hosting domains, suggesting an attempt to host and distribute further stages of malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://uleiuri.ro/userfiles/file/ruremorozuxekerax.pdf In PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/83f700b7fffca29283928344b07fdea7/97628723526.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/34d9770cfffe8629eb6550f7cd088d7e/gudigekimisovotojamitu.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/makoluwulekesozisalajit.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/sezupukufalugod.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/26652499785.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/836179712.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/gimojagin.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d127bccf3d---xidok.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6627be1c8---81055158463.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/bsgeiv58oqjs63iifa7tc4cne5/netovonawuvu.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2dbeb71680b057b5a6535d7e3501af02/muwabafo.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-7/20210507103418936186.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e30d96a4f00---76099346195.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef693cb213---45647211667.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/bizezijosidu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/937161ea5312e4f364e39b78a21c94dc/97800068590.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/jijenemenuviberubo.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/dowusotalaxadavix.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/a228424d9b6c5807cc17272a0303077f/41881017747.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927bd5c0010---sunexibuzeveg.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726a1b76ebd---tevowawirosadatokitew.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/bvp5256tmscntvcghrsbhb3d3m/lumotom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=foods+to+avoid+with+diverticulitis+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_off0000edaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C6 10840 bytes
SHA-256: 55820bd742704edb477e97c90f3a61dd0cb834c4c4d91ee1c932eadccf817eda
font_02_sfnt_off00011ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF4 16356 bytes
SHA-256: 17977f944cf9897a10520211e72119f42c22bbe0cce672bd470d3702a8c769b2

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