Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e767faebd73604…

MALICIOUS

PDF

83.6 KB Created: 2021-08-21 16:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 124ef44b9d30ef801272afcc19963149 SHA-1: e80ec9a5aa394a711a2f82727a2a8db4d045f029 SHA-256: 55e767faebd736040139223d319dccacdc686525afc2220342c2ff51b90c1a35
164 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous compromised websites, indicating a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of multiple external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.
  • 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://www.asap-recruitment.net/upload/file/dixirexi.pdf In PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/phhb98qr89cnvmc5mknvuukqf4/43581515405.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2411f7025963a4e7420e32d9dc471de5/72176649185.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/31876054686.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ktd7hj63m61q9kvfn1jvsnpfq2/bibig.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/80231734278.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/ragezosu.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/rqoaiobomu0d63rfntm2ct3mb3/rolemuxara.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/cbd32bfdab5d3b6118e5672bafb7c644/ruzajipupotez.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/zurodajipozaxo.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086961667de8---4426923501.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/63827840235.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/78698997483.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/51870024993.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf65e29ad7---13352468561.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/tukiwavejidovedemazijadi.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/kodurasakugejoselovoko.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608deedc614d4---97824495132.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/56619990814.pdfIn PDF document text
    • http://zerosquareonline.com/file/rejiwajinimonu.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/46206479520.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/n2qn02de1lrjlq98fhbahe793t/71192887762.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c8527df5ce0fd1c16e1ac91ad3d36d76/pagotizilirikazopufujop.pdfIn PDF document text
    • http://wenxuezj.com/images/File/64878100915.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/semelofefigasaperej.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/25295849929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=jumbled+sentences+with+answersPDF 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_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 10832 bytes
SHA-256: a5ae0de3715828d2bd9dfb10b20d0373f81de0b85f94d6a26fbfd044d3bf3b92
font_01_sfnt_off0000fa4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4D 17796 bytes
SHA-256: 63760c93abefbd91081a6b60d106e49a9e3e15e909602fd75fed58610de4dfb5
font_02_sfnt_off0001290d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1