Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6e1115d7a3e978…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 11:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b55dd355e1104a704833a4cb77dee6bb SHA-1: 1ad42bad4c89efb03c397bf3d4e74354ca168aef SHA-256: 3d6e1115d7a3e97857236a9cae5c4335134b9d82a8909614e656a37480d5cd77
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and multiple URLs that form a link farm, with some pointing to compromised WordPress upload storage. The presence of embedded JavaScript and the link farm structure suggest an attempt to trick users into downloading further malicious content, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://rajasthanmetals.com/userfiles/file/41652464288.pdf In PDF document text
    • http://emusicmarket.com/upfile/board/files/65324026449.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/7241ae1aa1a455cd3489a73caf912e15/kugapagofijonokesiratanoj.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/bofulapasisirilozina.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/safejuvemu.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a073e61290---42554318737.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/bogulowumebez.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/59677443301.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/58762622636.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/4254947652.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135504e25049---batagejivup.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/74134299494.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b57ea846bb---90496333156.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/68515236212.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gezedaxawepisis.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20219817711129.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/82776064135.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/zijoxuzorenila.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/61676573384.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/jasadalevomamuvito.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/gusitubavuwanipajojanem.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/15747595250.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161312538227f1---51426066494.pdfIn PDF document text
    • http://newshop.jp/archive/file/pokovamerat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=aot+2+download+apkPDF 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_off0000d7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D4 17588 bytes
SHA-256: 809e54d9081f6566e3085d6868b881a03a596b0b41b16579da1bbc5f78f68d32
font_01_sfnt_off00010595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10595 10172 bytes
SHA-256: 42da1cac0992db8dc818d4c29687f7238e2b4b48c0d68a7091b599c3b33b38b0
font_02_sfnt_off00011c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1