Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3cd9ea20252d19…

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 08:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b31a60eced0b3a5308e312c4c8a8dc9d SHA-1: f64b07ad1d5980be3abfc36566c1bdbbce3d14ae SHA-256: de3cd9ea20252d196a136de09861d5afe133347ac8324ba630ea3a02a5596114
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be hosted on compromised WordPress installations or disposable domains. This pattern suggests an attempt to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://medvor.ru/uplcv?utm_term=sct+x3+manual PDF link annotation
    • http://myredm.ru/uploads/file/27148740086.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/jitelos.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/52070981828.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/jukixasorojiza.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e97200885f---707372902.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ecb35e36---56572638700.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade716d8655---28374666415.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/gobnitsh0piaak0bpp2ssrbk6e/javezoguxujumonodesidelu.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160791af890daf---39141042056.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/sizekekesomegudelo.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/18303040169.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f57cacbd177---makud.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc92c5c1ec2---gutiwujuzagekexati.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac2335c283---68944532467.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/k2ilhvhfp77pahoccl8gspq2cn/14747292348.pdfIn PDF document text
    • http://artospace.com/pics/file/68139500271.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/tatejakajubig.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/79bv3h4jt2g3aichtu2nsulhig/mevapuruzore.pdfIn PDF document text
    • http://abwva.com/uploads/files/61897147446.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081e2a61cebb---4342705620.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/86298691902.pdfIn PDF document text
    • https://digireg.ch/upload/wuwojogar.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ltgupb8s4fna11ibr2u19ggiua/76564077654.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_off0000bf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79C 10228 bytes
SHA-256: bd0679f202220778e5d507e9409f3e9fa4ce96e1dafe7acfd89c51fd189318ab
font_02_sfnt_off0000ee9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 17540 bytes
SHA-256: 3abecbd65fc4af7a99f79edf5953b00e99690047943d3074f982d65b80d0eb58

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