Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d84b8d649244eb…

MALICIOUS

PDF

74.8 KB Created: 2021-07-31 04:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cd169441f16813b06a076a32b25a4429 SHA-1: 2b4db6621a949e70eed5cb0ac688b0265b98b4d6 SHA-256: 37d84b8d649244ebdbfa7ea62bea663bf5daed0ad7572a561116910a18dc46d8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malware or facilitate phishing. The presence of links with UTM parameters and terms like 'full version free download' indicates a lure for users seeking software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6416

Heuristics 5

  • 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
  • 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://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160810f382047a---lekonejidapopivabomavogo.pdf In PDF document text
    • http://kehlux.lu/userfiles/files/bozopizudiz.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/24999272901.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/zakadupelokedidekawubuke.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/aqtii2448cqd0hect5jibhajp3/60326937550.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/3806507479.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/lm0sghritkitcp66mh1fli3jii/kisizidekelexuz.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/vafime.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079f20fd10b2---95794398187.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/77986071203.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b1c34cc7a---gabibeke.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/zikigafumovavixazexejobu.pdfIn PDF document text
    • http://abnicum.ru/files/file/koxilegijobuxesefapusupul.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ul2h6q5suaqle0jguhr3gouoes/mowekuvofimiwajon.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0eb9a6051b8c66aaa3ff96d8819addb2/28810065967.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/vifedojixosapusunikug.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/645fa5d1276dc39859dc1447646631fd/xuxavuvupodogutodelajaf.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/kagikupetoponenifosega.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210609/file/13364117510.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c721acbe---xeporipu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f11cc553087---nilepapogef.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075afefba47c---38117049646.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/51201241877.pdfIn PDF document text
    • http://ahchala.com/img/file/69823744589.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/j5ivbv57b1sn3k87883hhfd4cb/57587614779.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/13771709208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=asphalt+8+full+version+free+download+for+androidPDF link annotation
    • 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_off00011453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 11036 bytes
SHA-256: 0dc622c165488cb65ca13be8b566919594a5879610664d1982e915c82a1c535a