Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc21c6e5fe19a971…

MALICIOUS

PDF

85.9 KB Created: 2021-09-17 22:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c9f4a47d583a6781d158fb046a7f5b2 SHA-1: fb6b8c5b55ee0686839a8d328e114642b650b325 SHA-256: fc21c6e5fe19a971039c7df5bf8080ee2acfb712d1e3972849ae3148509fa438
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4182

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://crysiq.ru/uplcv?utm_term=gta+iv+4+for+android+100+free+working+apk+download PDF link annotation
    • https://djennebeads.com/nbloom/fckuploads/file/vubatuvafarifosid.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/zedakagadisepejig.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132e890f1810---gegur.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/gexodaxuzebaxope.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/xezitebusuxoganimabujejo.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff20354cd2---sakisexiruki.pdfIn PDF document text
    • http://matras-devison.com/upload/file/xalowuxexozipuzedonuvaj.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/woteruzo.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/xoluzoxodigofafanadevit.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/37238469378.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/mulakakuravosow.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090315020935.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/16789249644.pdfIn PDF document text
    • http://demkapi.com/resimler/files/2596805607.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/18810628780.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/novalenusonelipovaweg.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f732ea7ce---serawelixufagowenunaxil.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/14960968788.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/geroleva.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/jagaxedotepolaj.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/12384057972.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/ranivol.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/wimuzulaxeb.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/86994598650.pdfIn PDF document text
    • https://jagominum.com/contents/files/60077856512.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/pufinunakotuwedanabu.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/retixidoxepuruvunufe.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/84680530856.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000134cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CD 11040 bytes
SHA-256: 4006c4252053d1a49af7754a1415de8597adf69467d05a7add32bf4212d64c2e