Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d570af4d96d1cb6…

MALICIOUS

PDF

83.2 KB Created: 2021-09-09 03:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 70fe54b3a4344e2f3a359ca61e422cc6 SHA-1: 7de192dd98f4bd0e6bde523a72a1a4647d941961 SHA-256: 3d570af4d96d1cb65da83d840fe9247625dfe8278410caba70a9f553a2b932f6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://catamma.ru/uplcv?utm_term=london+has+fallen+live+stream PDF link annotation
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613671ebe00f2---93697029636.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/jezevoxekizulepademafek.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/84235108812.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/neloze.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139318b81ff6---xijasajezorevovikoj.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/datutogomedaruzo.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161395096b440c---64438700900.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090907042040.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/11137417706.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/22274218893.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/kabekulumuwibozibixuk.pdfIn PDF document text
    • http://specialcats.nl/media/files/43863774711.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/51632494336.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/wefomatom.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/27360900426.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/75367429607.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/wobolivunu.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/23463465852.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/fuvaxopifasudegasof.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///mazomirujasarilezu.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/92423446720.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384f3ede80d---49456206983.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cafd1f7de---17652062978.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/5734209068.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_off0000e181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE181 10640 bytes
SHA-256: 1cd0e8c791372933fcb5154c43b0fbd449b1a8f3c9838dc9ff6d7d1ea47b3993
font_01_sfnt_off0000f9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 17476 bytes
SHA-256: 62ccf6c981020532afd74c3924a923ae97a41aa20c55f850e87e0f6ff42f42a9
font_02_sfnt_off00012715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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