Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b2403d3a03d039…

MALICIOUS

PDF

75.7 KB Created: 2021-09-03 06:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5833321fb0f8df9b4f508ce776904ecf SHA-1: 31d7b695679fa60695d6d93039365ca68f7f99b3 SHA-256: e7b2403d3a03d039e54f8cd75592d82c7c4d3c02bf6cbd7d360df0b2e01098fe
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, identified as a link farm. Heuristics indicate these links are likely used for phishing or to distribute further malware. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • 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://smidgel.ru/uplcv?utm_term=shapes+flashcards+pdf PDF link annotation
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b746c3f084---nisosukete.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081817e95258---sipizikif.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/58107570096.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160edd1b0b87dc---27116758725.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210717220311_1300627550.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/1468179468.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/662b94abcee003961d4de913957be68f/42746909453.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/61508343200.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/70354639720.pdfIn PDF document text
    • http://millecolori.it/images/file/rivepakow.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/koreketiwulapegigav.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/23464346181.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/nofur.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/vinexo.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/918229473732c42435d21bfddcc138af/jifili.pdfIn PDF document text
    • http://alohatoypoodles.com/clients/1/11/1122824db0f83c9e74cf39311881f217/File/35428838796.pdfIn PDF document text
    • http://from.ua/upload/articles/2021/06/16/files/nebugodapazij.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/66671886904.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/rekovizabozet.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-25/20210625092751138997.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d189cf9af57---kulubakosafakim.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/7736323804.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_off0000c486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC486 10376 bytes
SHA-256: 16076106be039259ce274744bb2a35b1ef9bfb9ab722ab114286844b1710739f
font_01_sfnt_off0000dc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC19 17672 bytes
SHA-256: 4cbbeae478cc0237ed93f7f60cc44aadda0f138305b1cb5c8e3e8f796abdcaf6
font_02_sfnt_off000109f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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