Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8956d9bb1f9b38…

MALICIOUS

PDF

84.8 KB Created: 2021-09-04 00:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 12d03caade58c5087286bd85b58d5345 SHA-1: 1a1de1ed4aa3906416c7268751830f63bf255392 SHA-256: ab8956d9bb1f9b3804ca97cd889137bf32605d9da6f4cdbc34897e1439df14be
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other potentially malicious sites. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/196e9c3b9d839408b8e3050e180879c0/lebovurazimaloluvo.pdf In PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/33tkmmk679or437djb8io77146/86110709906.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/73928322233.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/pajirateket.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/5f0e174c86fcdc9d9aa47a333407447c/88085954246.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/7b8945800306df7d1221ee582bdb4d02/sudimizipogutogawako.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c70e4e80d---81000326988.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/71690779848.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/13682337140.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/26000213032.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/tetokivevinuvodu.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/kofawijalomulid.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c2dd323d2---sonidimebiditiv.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20cb8ad42e---pisupig.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/56584626219.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021051504573970554.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/tapowawobotodip.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b6566270bb2---89836116222.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adf830d30e---42706438994.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/lafategedufoporoxibok.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/gixorax.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55fa87995---41202503702.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/zegup.pdfIn PDF document text
    • https://badrivishal.com/media/24775419087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=igcse+math+study+notes+pdfPDF 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_off0000e77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 10996 bytes
SHA-256: 24ba3ac35b4662715344561fd32ed8479ac18dd401ae09d8cb0823fb5fda0d63
font_01_sfnt_off000100b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B8 17548 bytes
SHA-256: 6301859af2ef7394b971ab8431f080907fdf45e680467d100efc5c332b2ec876
font_02_sfnt_off00012d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1