Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cae1b57712acd47…

MALICIOUS

PDF

71.3 KB Created: 2021-10-06 05:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: af3d5c2be60d481743e1f586b08187aa SHA-1: bf8bb6dc7af94fc0a95f313167d418135eef496f SHA-256: 8cae1b57712acd478ab44f51edea468d6cd72462a41346fc72c4ee2fc9c0801f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=marriage+line+touching+heart+line PDF link annotation
    • http://vizit-k.net/uploads/editor/files/79252563774.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/jiwukikedoxiriwa.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/32504515542.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/64884294696.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/powuterafukerikadipiwaz.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/55472519462.pdfIn PDF document text
    • http://mobilenmr.com/files/files/govowerajozuxufexuzovifo.pdfIn PDF document text
    • https://keongracun.org/contents/files/zazimowuvop.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/70612682690.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/kanimidotetabiwup.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/83077740209.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/pezovobotugab.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b8342f1b94---49922692314.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/79485716977.pdfIn PDF document text
    • https://polytex.de/sites/default/files/98963468178.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/pudofekazadi.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/vababewopima.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ede085ed77---fupod.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c25d749040---darolixomeliwotu.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/2930390313.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/e7odm1egdkgu5gfjr2t4l3q4ca/43466836049.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/22311021882.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/dipojerepap.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/rexezefej.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_off0000b7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD4 15728 bytes
SHA-256: ffbe3442ce613e1a50c43dbd88a88f71df379cccdbb4f4ef0e41471b97060123
font_02_sfnt_off0000f82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82A 10432 bytes
SHA-256: 6d9f90f7c5893416518c050f8aa2f921467f44378e71f3fb5d31f9c0b5fab606

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