Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb48e8ffa653f498…

MALICIOUS

PDF

94.0 KB Created: 2021-09-07 07:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eb00c9c9dd56e3f26a06a8c07f8c7bda SHA-1: 4a1b9ebcb7909fb8704e3d7356a371b59af7e5be SHA-256: bb48e8ffa653f4987cf4144f1663e4bcea352a13e79b5c30d782eae4ec635107
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting, indicating an attempt to deliver a secondary payload. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The embedded JavaScript likely facilitates the download and execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.2484

Heuristics 7

  • 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.
  • 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://www.nena-artspace.com/ckfinder/userfiles/files/63308975688.pdf In PDF document text
    • http://bettaletroom.com/file_media/file_image/file/silave.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/gikajegupasevekisi.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a9067984---gopuwuvilonajij.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/16904488887.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/62733280367.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/temawimosivuberogidibiv.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/32817329095.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/bexerodekopojetadiruxi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9611b5af3---dexada.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/c3387798df5fdba92e02bebc8b619b03/jelotewokorel.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/pijukabiwarawasavetimodu.pdfIn PDF document text
    • https://taperagi.com/contents//files/walexubikuvupatezo.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cbd810867---bapakot.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/bonenesed.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/46206271227.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/gejatibanedetidigiwel.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/1183769691.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/rabutuvomuxo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b6df177f7---nududefunizukile.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/i6m3tqqt3ksresfm9b453511d4/ditimamabogirenamuvukan.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/92611447244.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/736eb95283dbb6a89c5f593e617a08de/lazuxobi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160745287d62ec---wukipuxugiparazemovuwobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=callate+y+besame+pdf+zara+black+google+drivePDF link annotation
    • 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_off00010d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D21 11364 bytes
SHA-256: ed3ff2d9c2be7e039348699f793348441ebc9cadda1b8bf44f01c5c64f3017ed
font_01_sfnt_off00012796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12796 19664 bytes
SHA-256: f3a0611bab66d50bc6b28e08f4d0a9cb081d41cfc161cc04e48a00dad6dd1d4b
font_02_sfnt_off00015aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1