Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89ed3dcd459d50c…

MALICIOUS

PDF

70.8 KB Created: 2021-09-29 12:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 04755f6bc8ef2de43ba7e0335264500b SHA-1: 45401999579d09b493c7f99b300ccd31c04a6263 SHA-256: f89ed3dcd459d50c5bdfc769e89b859dab7ab6d5fc9168c0665c398b07eb0160
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=y91+camera+problem PDF link annotation
    • https://stdtekstil.com/upload/ckfinder/files/15771198436.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/94245109643.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/vebutatilosowelamubezonis.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/3aadc27ad18b84d3faac6163525590b5/32961311472.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/vavibujiroduredaw.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/jeribaguwibinuzijus.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b12e508c2f0f8a1741d3c9e23db7c0b4/58922217735.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/72512469706.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/45817010308.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/4182707284.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/20501735926.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/42869492931.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109111550532779.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/kedaxa.pdfIn PDF document text
    • http://klpa.net/userData/board/file/63253404895.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/48e9eb0fbd74797897686a719093a9e6/zemarabufo.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65626538315.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/25223061963.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/87785617948.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/nunaxedibafoxemo.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-15/20210915181829997096.pdfIn PDF document text
    • http://matras-devison.com/upload/file/ketoloxafov.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/bidonurukutaviwarijudawe.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/42511380189.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/47481778706.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_off0000b26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26F 17012 bytes
SHA-256: 5807957a61e6022857a5b76769ba67ba546da2f49b12296b60efb409f82fba3e
font_01_sfnt_off0000dea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA3 10416 bytes
SHA-256: 16256e7b91afac0430ac31bbe053a5aef3224ea788e5ecf1f68de49277600d2c
font_02_sfnt_off0000f617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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