Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc0765e1450deab…

MALICIOUS

PDF

79.0 KB Created: 2021-09-20 03:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 236280975ec7c57aa30496b7afebc3b7 SHA-1: 3ad38db8e7fdca964de001ea81f165c9f939e166 SHA-256: 2bc0765e1450deab1f3955eaf35b8c86b90dadfc77f3fc3dd9b43168d208b50f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://3suntech.com/UploadFile/file/20210903070036575.pdf In PDF document text
    • https://sentinels.ro/userfiles/file/fubirajabamosoweb.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/10717516013.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3bf399769---95225648591.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/84584223816.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/83529167267.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/65568470141.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/65333082043.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/disimelo.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613445bc89bc8---nubukivujegerikidu.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/85020350395.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/zujobufowaxesabage.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/4274553796.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/81898502109.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/15541057708.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/95247342566.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210902090824_646986189.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/77046191233.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/xifavefelivuvavuvajapekol.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/vofonu.pdfIn PDF document text
    • http://atamergranit.com/userfiles/file/38680697022.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/62770380360.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137756077941---35399620154.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/dunilidujafar.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/beridejizuxomununa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cordova+animated+splash+screenPDF 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_off0000cec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC6 10876 bytes
SHA-256: fe7a0176d8800ec037c592166129da1caede1104de96a3ded207a802d290d37d
font_01_sfnt_off0000e7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B3 17772 bytes
SHA-256: 606b2458b954eb988636d2cd5bc941c912a01e8da74c443bade8aa3e31675d5f
font_02_sfnt_off00011670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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