Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a203800cee4fd48…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 21:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bb32cd85a07cbe5efa4dfd378cde86ef SHA-1: bdc665a2bf3b2b25296617a00521266cd1b8c06c SHA-256: 6a203800cee4fd48b63a3519d732fbb1de447da0600ae0346822f6873e85358a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=best+mobile+rpg+games+android PDF link annotation
    • https://immobiliareincentro.it/allegati/file/xujuzedufinisirususe.pdfIn PDF document text
    • http://labradory.pl/file/34106385215.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/7fca1b8fdfc9853637a7c38720586af4/zoxufanowasivomuxofid.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/19691294561.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/12968989720.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/kaxitutexilukowekepoxiv.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614087a0c3eb2---kilukatuwopapanefedejozo.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8f9a2939ef8bf6344ec87fb7ec05e545/19936202736.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/lifodas.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/xedoboken.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/67031969800.pdfIn PDF document text
    • http://packamate.com/userfiles/199809057.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/xewibumetumuxejeg.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/dolidukumubukisuxovap.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/29933764061.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/tudukudubejudofotivovukup.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/84037917219.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210923_100458.pdfIn PDF document text
    • http://accronline.com/userfiles/file/44140182757.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/lenepekesawazob.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/maguvutefikegutinimuriwe.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/44053610911.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/51666022696.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_off0000af6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6C 17108 bytes
SHA-256: 76452e9d1a73d28fd5ce83e703f498b76a82438498c0b31109655bf28528cb90
font_01_sfnt_off0000dab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 10928 bytes
SHA-256: 5b847b24235bfbd9780bdb0f3e96e3121b14e073546a3f608dbede344d21b5f2