Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c50d9c88dd4fe7…

MALICIOUS

PDF

86.3 KB Created: 2021-09-16 01:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a66b5ae625986ab79035078d0c6f7fe SHA-1: e85b32542883c7e3fe856a5168c50d97f2a6c4a5 SHA-256: a2c50d9c88dd4fe772abf7aaff4ca49347dbf6909333c45e64a58f788c816048
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm, likely for phishing or to distribute further malware. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=which+is+the+second+biggest+country+in+the+world PDF link annotation
    • http://miraesusan.com/ckupload/files/52015485619.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132de76a6c35---58096033825.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e3cf860db788961e4666f6829add1621/55035262283.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/titezesix.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/piralovemogidojev.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/63355572427.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/wiwijuxipokixedi.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/ketoves.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/efd90652d5aa3b7f63fac819088ed7d0/83369952818.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/nokubogikakaraf.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/nedepijewof.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a229878e96---rifiguxoroxurizenejaga.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/12343527309.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/nufubukuzufalipupuza.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/39644219350.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/020310123493.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f04b79b81---satorovipine.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/b4fab1b7bebb9fe8b479e7bd48707dfd/dotuxudasefegox.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb2cd5b28---60738778717.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vopefibomuruwafuxosinumo.pdfIn PDF document text
    • http://africareview.in/userfiles/file/ridinezomoniloduxusulom.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/5e38d10db4be3665ea395f31efaa398e/60614599820.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/xavevizivuro.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/97944873543.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_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 10920 bytes
SHA-256: c660bc64b119708048d74e19262b63204463ab4be845af4c06204ee17982c2ff
font_01_sfnt_off0001033e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B50 18892 bytes
SHA-256: d8a57e171e425e1bb7093ade27e97a53bb22a53f41546b36a083b6a3f07e03f2

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