Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfad441b2b21570…

MALICIOUS

PDF

93.0 KB Created: 2021-09-06 02:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 46f4a87edcf3387a4c281d3d96669813 SHA-1: 50e88433096b9d3ba7e7260af1ac113b88e36102 SHA-256: 9cfad441b2b2157031a4ec411c00eb96b6ad64baec793adda5949e57768f5356
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and a link farm pattern points towards a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://hanleyresources.com/images/82777616498.pdf In PDF document text
    • http://dlzj.net/upload/files/20210628165523123455.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/bosomorubifi.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/vafb4to3f3eieco4k5j3mgal65/12916610566.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcfe0c8a7b---66907155808.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/negasenupokomaveravuwumul.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/0ef7776ade57c7fdd1c2ce48e83a4239/kobawawo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607685e814c65---81840226103.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/66421235320.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/d9116bd890581de0d4d3e23ced698a16/50326189018.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/99425449198.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc190da877---risepojeritefinisubo.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/68119569080.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98b8c32df4---tefivojujupitaxizekatevop.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc019dbeb8---92454494726.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/sasiwebixemotegafoputofi.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6896925a4---lolekokelawewapomi.pdfIn PDF document text
    • http://poiskvod.ru/images/file/likovudomewirawu.pdfIn PDF document text
    • http://hueide.com/upload/files/55986308420.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/66770562113.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/mozujelikixugakigi.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/3226d5b504f65793b35cac653202ebcd/2336581015.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16102cf772c812---xolalogotavatemorixo.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/zeguraneluberifevez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=apple+annual+report+2014+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_off0001037e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B90 19220 bytes
SHA-256: b71658a4995e01a4079398d9d8e6ff0948f94231fea7919318d919fbddca1add
font_02_sfnt_off00014dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DBE 10684 bytes
SHA-256: b77fffa2714c16a992f1398d4161ed9aa741894bcf5be3eae01ef4f8d42dbe52

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