Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f31f471625dc4c3…

MALICIOUS

PDF

87.1 KB Created: 2021-09-15 03:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: eb8c7356bd004d3424da693182cee836 SHA-1: 9f22017bb407b19733b39b147d3383ed509da8fb SHA-256: 6f31f471625dc4c35c8b4904d04b408bf8dd1118581f2a9815f036fdd0f91019
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=apps+moving+by+themselves+android PDF link annotation
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/pisovulifinomubapitovatub.pdfIn PDF document text
    • http://ihdbd.org/upload/files/76821890155.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5a0h5j3hb4puosil1rkgl1a5e1/vevojunifo.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/piponomiwoxul.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b5b5785b---vebanapijavonuxufumo.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/70804064700.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/15561781309.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161411eadd9c5f---zogolewudorakik.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/dadotevozevezovuzogoxe.pdfIn PDF document text
    • http://naviway.su/upload/files/bejoneregigumofuwitil.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/jusoviril.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210904105718884.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac1119368---91843833613.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161386d7092097---24351052109.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/70810040957.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/pupukagoxisuluz.pdfIn PDF document text
    • https://trexanh.net/upload/files/leposawarozibiko.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/91800732865.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411d7bddb80---23744513433.pdfIn PDF document text
    • http://thaide.org/userfiles/file/vorupubedevopiperom.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/wovonok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137380f66162---63031817234.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/bogul.pdfIn PDF document text
    • http://kelvista.lt/images/files/lalologozirogeburevimok.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2f86be88c---41989136568.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_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 17180 bytes
SHA-256: e96f4abc5ddc5c8c01381b5cfdfa6ef7d31d5c16a41c6cf183a2936d44bdbe58
font_01_sfnt_off00011ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEB 11140 bytes
SHA-256: 1ee40b23d9168e8cad4cc6e2db18a09edfdc7fb9e1de4e805cb6a9c2382ac3ac
font_02_sfnt_off00013660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1