Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edeaae5da0562d8…

MALICIOUS

PDF

85.5 KB Created: 2021-09-19 03:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e56f0cf9793cd9ef19fc8d40f7fb1bb SHA-1: d160d0287d1b1c0d1b13396664ee1e39eb89d2ae SHA-256: 9edeaae5da0562d8b867daf0e883906e761bda82665eafeba35faae1e4515fae
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with multiple URLs pointing to compromised CMS uploads and SEO-optimized content. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=wallpaper+for+redmi+note+9s+punch+hole PDF link annotation
    • https://classconnbio.com/img-jacson/files/vigilidewuvosepupa.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/nazonerufupisiw.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/fijobibugenololuzonokulez.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/20353789140.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8ce5b892c---wewasawi.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/mabudaxejenerib.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/37549567535.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/natefuduzebake.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/vowebevon.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/26790912248.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/98522489131.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d15ae86e1---kawob.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/mafitewirojos.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090208494073499.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/71339786003.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219616121508.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/44987361749.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/vgeka2813jh0cktier7dbt4gug/77418531226.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/ninegorifosines.pdfIn PDF document text
    • http://mdtrend.hu/files/file/muripumuwebib.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161305d4e794d2---pewofamavivar.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465b35cbbfa---38002860970.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/pokiridikidakipi.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/kesonogopogolosodolimuzo.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109131534134276.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_off0000d9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CC 22380 bytes
SHA-256: e2b4d694ef439e3d4848bdbb20a6cb71a4e3eaebc6d9f9e27c3ea07f96ce4533
font_01_sfnt_off000114bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD6 11148 bytes
SHA-256: ce4c1104248e7c7791b1f1351331da21bd94158565017cf315ed2e37b4440552

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