Malicious PDF — malware analysis report

Static analysis result for SHA-256 991a794adb7ff710…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 17:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6bd1f9bd53c3bbe5351313c0ad3e8244 SHA-1: 1ce0ff7aafe5ea9277b2fdc477980605b783786c SHA-256: 991a794adb7ff71022e2e56bf2ba6ca65dfe8f4f212538263ad76b9abd75a1ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are then used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://aqs-group.it/userfiles/files/ludamajatabuzaxopubuwu.pdf In PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/fogomozil.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/l9p31rjqhvd7b4d93sn56sfq5m/41822453757.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ad8626819---39722279542.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/fiwimuwipizotaxiwuf.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/jodixiriwosepobivovawiwoj.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9a0b1fd6c---dazuvojimumalubevedopeje.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f8bd643a7---6893051700.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/zipifomomosovebif.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210730020409106.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/zaxujelorajubizob.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/d451498577a824e2c71899796e102679/52419089119.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/misod.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/83d61edce2cebf82710c97fb9e92e60f/patosifenoxofitomam.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/84024821245.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/82253130753.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/memijapetelajilexibus.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210730050549.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/guselem.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa24ee08e5---22633821429.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/64dba55046f4e48dae235da6b5795038/kirovajo.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/libojugevoxonetajem.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/41c6dsvfpotskivgp76bv0oblu/93816434450.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/dubusuwubi.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1612550c8b8694---fatokaxotibezorubuwuzov.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/53826535649.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/25da26bf7716577ebbc74c2d181cb4e8/9083183807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=quintus+tullius+cicero+how+to+win+an+election+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_off0000e0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 18952 bytes
SHA-256: 4119b8778901612c9cbf9ef61712bea04cf6b423df86652829d95eea3f910f0f
font_01_sfnt_off0001126d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A84 10960 bytes
SHA-256: 89b71b23359dc4a5a2a69e2cd3e9eece48213b58bf6124d6fb249401c0c348eb

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