Malicious PDF — malware analysis report

Static analysis result for SHA-256 4899d6692fa4712d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 18:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ad7c63ba65393364de12b802733b681 SHA-1: 11630ebc3f36815b56f41fc33264655d814c89a5 SHA-256: 4899d6692fa4712db4086ee4d251fa698f4e4731fa6b8774bd2a83e10ea28dfb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pistant.ru/uplcv?utm_term=aagadu+full+movie+in+telugu+hd+1080p PDF link annotation
    • http://studiomilano.eu/userfiles/files/ziwosaduxivup.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/18f93dad593899bed546078c7d0cfef0/gewojuvoxubeke.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/9140361365.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/pukikiwunejozufuvu.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/91197033435.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/80330885890.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/21729627034.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ffbb51858---92487368964.pdfIn PDF document text
    • http://juentai.com/userfiles/files/29669883245.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/jekebawuwekolefugox.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/60720574610.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/9302966328.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb6ce4b07c---65786516302.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/webetikepogit.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109091106327029.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/75722106914.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/55662610986.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/lanag.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/18236428613.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/mafadagiluxuxusazaxelab.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/52353320042.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/26836205205.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/69210264279.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/minerudazulikatas.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_off0000dadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 11204 bytes
SHA-256: 2f452f616e487ac6f23a6d9d0f70ef9579259bbedaf41c7ee174602696076605
font_01_sfnt_off0000f4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 18784 bytes
SHA-256: 5b31f178939bb424a9bf44af8a4842fd8db41db9be98761564efed21b1250b00
font_02_sfnt_off00012591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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