Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6f927e6d726d81…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 12:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: be50a356b491522e3d3982fa83c18f21 SHA-1: 771c32d288857b6a13fbdf46a8cc2f412b610524 SHA-256: eb6f927e6d726d81ed2880ebac07169b548e9d6d46fa03a13e4585a72796fcad
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites, including one hosted on audiomaster.se which is flagged as a compromised CMS upload. This suggests the PDF is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe96adc499---24904295272.pdf In PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/11092659463.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/sukavawudaze.pdfIn PDF document text
    • https://123natura.com/stockages/files/9110312171.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947c50c5261---lisulipuvusefixuter.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/7576cde23367dda09d9ba6e7c9b31c95/xatutuwenalovatanuriw.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ace36ad1b26---49203059400.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/94904031535.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1623284203.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/ranabizakasorazan.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/larudapupazisefu.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5b0118daed535d66e34452c7d03a84e4/nadobusifutojojifava.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/64sc67ei225pc9nv4404uh8rv8/fexibepenupamobazos.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/b4d6f783ac7b8d873c4dd89acf5ef7d7/dividugoda.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/7dd776e32206e145b6ca9c67d3f09d11/61891157390.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/8696089138.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/bagowinobolex.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/25299618015.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ec1634f5---67721250775.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/mirowobil.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088039bd90e6---lafawer.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/rgadqec75g765dq3qemgajfnb2/gekogolexomejomupeba.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/gm7ur7egcithbig4up612d2i5b/kuramowivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+type+text+in+circle+photoshopPDF 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_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 10600 bytes
SHA-256: 5f8f208c96421e8b2f9dff81cdbedaaa55e0a681a6bc19cc34943b8de5e3e623
font_02_sfnt_off00011212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11212 17584 bytes
SHA-256: d1542a99da3a59adff562d8a67a048c47ef38190def1b3bc57db9d07270c01dc

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