Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac8d7fb0ef3a396…

MALICIOUS

PDF

82.2 KB Created: 2021-08-13 12:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 048a624020f800cc9ccc3f9be0c9d3a9 SHA-1: 90f8d136726b1d766c196fb22cfcda2ab3d5f489 SHA-256: 3ac8d7fb0ef3a396c7fb123f68053b78460f53657b9b615fd34d4f6e010430ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and an ML classifier. It functions as a link farm, containing numerous embedded URLs that redirect to other websites, some of which are also PDFs. The primary purpose appears to be to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://myparrotfood.com/user_files/files/68608343062.pdf In PDF document text
    • http://mikailang.net/userfiles/file/20210510032406_1094486934.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210707_084422.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/df39376b27c95046b40a4e9a6289379a/66916247720.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/fevuxogowazokoriv.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/f56652ef007cd572c41e20aec8e07425/94743557181.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/3934487502.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0db6751288---wujoxaw.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc59f1f31b---76938493155.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/pipofafogoreri.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/lugekosupepa.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/gemogamebawitexunezeti.pdfIn PDF document text
    • http://lulanjina.net/upload/files/89095059434.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/o2e9q2bek14g6gp1bfsqs59n8o/tomufofawadevujupamak.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/sulabudi.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/1879468303.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7650d703d---48215334921.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609995e97ce55---73904739408.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/loxakov.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/67727302563.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726e8a3d144---8976444498.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/4860603961.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/fozuwano.pdfIn PDF document text
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/tenezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=dactyl+publishing+english+answersPDF link annotation
    • 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_off0000d938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD938 10972 bytes
SHA-256: 892686ed5c67818ac29bc65ac2a08674d1d382ba6f9e765f8e8d5206d4468a57
font_01_sfnt_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA5 18024 bytes
SHA-256: f8c83a1e32cde5f6bf9bbf051af30729b4eb4d74010c351f451d1b4189290a25