Malicious PDF — malware analysis report

Static analysis result for SHA-256 933d93df81d268ba…

MALICIOUS

PDF

90.9 KB Created: 2021-09-12 14:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 498e4663a31e1b92e3c52bafcb37bc19 SHA-1: 1002a232bd424a26d654cd757930261314d74140 SHA-256: 933d93df81d268baad594409755f28c2f3352aac2c885ec5e16da282eeef3617
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites utilizing CMS upload functionalities, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://candbco.com/ckfinder/userfiles/files/98415880661.pdf In PDF document text
    • https://maggievanostrand.com/uploads/media/file/kuluxozekefasalanexosa.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/97222078443.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/fagaf.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/28288661359.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c04f6719be55c25f4e5291300dabdc98/49841208075.pdfIn PDF document text
    • https://windscrm.net/files/file/30636154419.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/69537332215.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://pk-rowery.pl/user_pict/file/ribotigijosefa.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee97f8b775---63899383181.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/batopu.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/58153187874.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/83885674848.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/97510041954.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/fives.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/13538922550.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/tozafuk.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7tgik3khi9acchjrpo3tftk93l/83512926569.pdfIn PDF document text
    • http://erex.hu/upload/file/buxuzopozufejipibuda.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/5d6sqg7icjqgv5mclf9pham67g/49721095749.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131696bb919d---75902417907.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/kewewukuzelepos.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/zedugogokoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=lord+of+the+flies+book+downloadPDF 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_off0000fd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 10728 bytes
SHA-256: 41eb3b96cb9ccf64f68fc06c8ab78291707ad326a18a8f8c6daabae476068a5c
font_01_sfnt_off000115fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0F 18324 bytes
SHA-256: d8aca31efd3231549cfbad096474c2717d26acb42091c517fcac309c662bb4bf

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