Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c4dbc63c547ab7…

MALICIOUS

PDF

97.9 KB Created: 2021-10-13 11:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 89fbe1cdad53f780e040f68bb6b6a3f6 SHA-1: a56883026420b3017315bfcce50508b80952b91d SHA-256: 48c4dbc63c547ab760ca761c0b5e847711fef7cea1988a9e27367609bca481e4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or delivering a secondary payload. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=simplify+root+48 PDF link annotation
    • https://vzduchotechnickefiltry.cz/docs/47558617328.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/55ee07c8bd0071799fc6eb9a46837190/71436702172.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/bixojodomiwuxekovoxopisav.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/abc38d4e64b7909fe47dbb5f4d76884e/suxivejapejikefumo.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/43273310354.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/kadofidoxixodowurofavovev.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d66dbc1fb711f236228f0722aca3479d/zarikakive.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/84546551982.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/vadisobunixuj.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/dizuvuxu.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/80692374422.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/tonewumozetadupevov.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109221330392742.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/65986141622.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109110134041474.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/38980428491.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/19567185088.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/9131327899.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/57127151427.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca638e0679875d05124e094ab696ca42/veferedesipa.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7fcca2043a6520a83addb8f72b901d91/85761389110.pdfIn PDF document text
    • http://profstil.az/userfiles/file/wezagipijutel.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/zozovorojunupomijojikod.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_off0001140c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C23 10428 bytes
SHA-256: 4f6fa927bf2df4f11719b718330f968834368e3eb90b13ef9870f443858abbdc
font_02_sfnt_off000143ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143CA 20752 bytes
SHA-256: e4e87f25bf840ab7b8146bc0f37fcba2d39961d728897af3180a114b4a0ee945

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