Malicious PDF — malware analysis report

Static analysis result for SHA-256 25576a9e73174e81…

MALICIOUS

PDF

86.9 KB Created: 2021-07-03 01:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9b750c91e20703cd5a14f776d6adae88 SHA-1: 1a4da35191382680a15d3fbca057aa06834684fc SHA-256: 25576a9e73174e810b418a430675ab99b53fee40b55cfbcc65fcb91dbeb12c2b
156 Risk Score

Malware Insights

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

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, containing numerous URLs that point to websites, many of which are hosted on compromised CMS platforms. This suggests the PDF is likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://huntic.ru/uplcv?utm_term=starting+a+rubber+band+ball PDF link annotation
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/ne7lf74l12vk44n14cm1pgfp7a/36735102244.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b8264148a---52482287014.pdfIn PDF document text
    • http://fittbike.hu/files/file/24162832292.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/faboxutaminif.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/jeguzilolodenive.pdfIn PDF document text
    • http://buildinggodskingdom.com/webcms/file/74539568654.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/94024894010.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/82739540620.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/gewarumas.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/oioo8se4nmilitv4oig46mbj58/gabozegojipumino.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c719f1807f---loxolugupalunenodepa.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a844d688a5---49568876471.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/xubolozovowetila.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160846dcec0066---69976518622.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ds256jdr27vkbv3j6tc9k9v0e2/pizenaxemasuwoserubiwuju.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/54344637610.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/4a48547f5f0e0dbb6eac760bd79352ff/59066369331.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078853e68986---diwewireloli.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/47861710199.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/povuj.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d47b316916---piregoxatum.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/vawenuxizipitozimevuvem.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/41740278081.pdfIn PDF document text
    • 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_off0000f1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 17336 bytes
SHA-256: 49086b01d4156e4c8528fb38a658d55194554fdac41c521b4b8a20a097f9929b
font_01_sfnt_off00011ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D4 10452 bytes
SHA-256: 681f4b70f8f53a9fe7b8d064e9209221588e40b90b344433319ffa8d072cc30c

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