Malicious PDF — malware analysis report

Static analysis result for SHA-256 464f1257029529d5…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 11:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba98aa0981f18e619285028241ee69ef SHA-1: df0d85148858a47db4f9ce5532131f5deab5a8cc SHA-256: 464f1257029529d51023a2dcf2ac2a3fe8822346b0875601979da02bc4496305
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm, with many distinct hosts and UTM parameters, is characteristic of efforts to obscure the ultimate destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://synerhu.ru/uplcv?utm_term=android+messages+not+making+sound PDF link annotation
    • http://hanasushichoice.com/uploads/files/50594896706.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/34517174109.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/gugomavego.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/supivizafuzopo.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/453109515.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/90237902362.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/vitofuvaruzizak.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/17181005195.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/25634710869.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/66280cc8d6ead3abb0b916653ad0c88e/pibavopabozinekitemet.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/sanixomulunove.pdfIn PDF document text
    • https://fishboat.hr/files/rezikotepoxepesafuripuj.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/8655549796130d1372b543.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/10127948672.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b53a7e52b1dc29b7e2aa51df872a8953/tujejimiv.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398589b5fcc---90836409498.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fbbde9d16b5fc8907339f13fef1da0eb/gorebijelezivunilusasa.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/gerofevin.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/raminolume.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/luvakemez.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/29670682653.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/lojekejemapodojorekujo.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/xazejebevinuwudejususajil.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/9444401381.pdfIn PDF document text
    • http://ty-int.com/files/files/93176222132.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/lixarusixubesoziwunuxas.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_off0000d957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD957 10720 bytes
SHA-256: 18ed7cd5a69e8d012be2839783e4156de0bbe073cb022aae6a1533cbd90909a6
font_01_sfnt_off0000f1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 18256 bytes
SHA-256: 1f570753b6ac17c44dbabb3396baa1f16f06454ca4d872789b9d7200c02196b9

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