Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b963bcd274f901…

MALICIOUS

PDF

82.0 KB Created: 2021-08-21 04:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a6a0d5ab500a6d8eab588d8dac09de55 SHA-1: 06a6433e50b4fc8d9501c3df58673e5c9919f7c5 SHA-256: d5b963bcd274f901d609e3fcb861ac79fae1159cb1083e91d51592a18c3daa79
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and link farms indicates a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=scary+movie+1+full+movie+in+hindi+download+480p PDF link annotation
    • https://ystechpro.com/nbloom/fckuploads/file/39943123110.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c689b7f0a8---61913226534.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/93131196856.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607006860ad1c---biwifefimarexeguxiruv.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/deqsbqm0fhh0dp5872etho93l6/37345762778.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/vagodiniredewu.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/jodabixunivenozib.pdfIn PDF document text
    • http://edu-mate.kr/_UploadFile/Images/file/85475297015.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/samefitawesad.pdfIn PDF document text
    • http://asustainable.com/global/file/gipulaj.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/deboka.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/27854786066.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/83892884404.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/a0fe2765766807d47a4ce89a6b86fb63/21928670903.pdfIn PDF document text
    • http://lagrupacio.cat/file/gonukijowisujovumipusojas.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/xosinesu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa10c691c---rigafomomuw.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/titofusibejodo.pdfIn PDF document text
    • https://funbugs.ie/files/file/96702046347.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/1260009086.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/gofinutoxilunuru.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/25045312541.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/wabidew.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/5164472718.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/41562114896.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_off0000d9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BB 17168 bytes
SHA-256: 4affffc4aeb50a66b9c12dcca9fc179cd50dbc592fcd51e6ac6cf48330d96f93
font_01_sfnt_off000106f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F8 11520 bytes
SHA-256: 9ca1739ecafadea38f07ee0061c4d83946a16b063a6582ccbfaab3d6ae0ca6a4
font_02_sfnt_off00012235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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