Malicious PDF — malware analysis report

Static analysis result for SHA-256 d217de8460b4fd01…

MALICIOUS

PDF

80.7 KB Created: 2021-08-13 14:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 718a61f613e901f8881b3c3e51e812bb SHA-1: 26ae730b30d33663608549c7d50f6854f6735900 SHA-256: d217de8460b4fd01ae48206d5c5163501912c6f6c04d666f50cd6a50e2795302
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised CMS upload storage locations, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous unknown URLs further supports the classification as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a04e3e5a875---67106599477.pdf In PDF document text
    • https://ecohort.info/userfiles/files/tolitobiladojajanudebedir.pdfIn PDF document text
    • http://101balkon.ru/upload/files/31562981480.pdfIn PDF document text
    • http://sooclose.eu/upload/File/51336167902.pdfIn PDF document text
    • http://www.centralperdana.com/file/40194039920.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/ferifaxup.pdfIn PDF document text
    • http://vhktn.at/images/content/files/xibibusemitaguwulobe.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba953131d2---31648057475.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/22722113627.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b456602d706---5940441553.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c550dbd54b---ribipowuveniw.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/visoxegebiliwaligube.pdfIn PDF document text
    • https://wecareprogram.org/images/file/vuwesobugigupedekupi.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/tufonudabaporozexasol.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/72469209603.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/g34me04aego5132h3rbjifum8k/kopalisuf.pdfIn PDF document text
    • http://lagrupacio.cat/file/71969984604.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/kujenenereki.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/detaxarigixezuvafeme.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/lekoxoliboxemufegafoxepig.pdfIn PDF document text
    • https://designclarf.it/file/439529727.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb411392d5b---zanexadokozuwif.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/22989143555.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607df75b5edbc---gufawupedoguxize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mesa+safe+changing+codePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC448 10504 bytes
SHA-256: 61a5e60ecbc0fabb756015c88485103f1c1ef84932a476694ea8d0e65b57d608
font_01_sfnt_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 16076 bytes
SHA-256: 9dc74535a6692f4260f0355970fcc7bc2a5c5af40b851cc3ce6f07945a46146e
font_02_sfnt_off0000f109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001091b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091B 16888 bytes
SHA-256: f15fd7ceaf09c2bf981a62223eff7e4076fdb63a5a68fa1ca77579ba62ef400f

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