Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d0992d3974bc5a2…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 13:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 25a2d8fd9a5945027c660b82a6e5a036 SHA-1: be014a2e065583d330f8dcdb3316128515588d90 SHA-256: 2d0992d3974bc5a2bde15ed102a0414a73422ccfbc41d5fbcc1a538fe6131ee2
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614138398d544---73432828497.pdf In PDF document text
    • https://alohasafaris.com/files/wodopetasabudivulagul.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/lezafaxavuzo.pdfIn PDF document text
    • https://izometal.net/mm/file/dixibaxirisujibeliwurem.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/pamosozosabe.pdfIn PDF document text
    • https://taperagi.com/contents/files/siwipe.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/vexeb.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/10014999380.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418dff71541---37791007639.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/mawufaluwizuruseb.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/15180363890.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/xerasuxatafelal.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/zatuwijelumil.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/6354620900.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/17669580569.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/furikikev.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/lewaxolixatal.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/4f538232189af6a1792abf768d9180b6/27143780130.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391c1808f30---75414267473.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/tedarufezoruzulujomixave.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/92871366501.pdfIn PDF document text
    • https://eguiders.com/uploads/87948205022.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/84446981718.pdfIn PDF document text
    • http://charontrade.hu/data/file/vejuxakokaladikijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pubg+lite+update+2021PDF 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_off0000d885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD885 17696 bytes
SHA-256: 58331c51e6ec26ec9767a40b3c7207b79bb7c5cdb1a737ffe350bcc9487ac45d
font_01_sfnt_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 10612 bytes
SHA-256: 01463cfb441ee4646dc15962768049216f7bf23ad89c03ae94ceb6465714fec7
font_02_sfnt_off00011ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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