Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e17adb4f86640c…

MALICIOUS

PDF

70.6 KB Created: 2021-06-30 00:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d4396aa1a762a29aa151213810298988 SHA-1: 13f7fcae62b4346cf0191cde8f3145df48d019cd SHA-256: f5e17adb4f86640c2eb57fe9a6b88efa46711e43169ac28225613e0916b7a7d8
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6630

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://aspaeng.com/files/image/files/lutumilokagid.pdf In PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/rdqv2fsdto921dc44ohepprtbc/16462512213.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/1a320d94fecaff24e8eb865f4e74d024/37942826498.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c9d5e9ce---xufujabepaso.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/zelobodifowozobelumadit.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/68814053233.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/28957419618.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/i70rvam7v4d0eknljft5d1bdp1/juxufalefosidorokide.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9042a59fd---7890898940.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/febosenuxipikoredi.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2f6b491f4---kadivoneribibibirebiru.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/nagugara.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16086f734c901a---32019668232.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/1f85443vsb92pd2sg06j8d0qqs/mofisom.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/vezifokidabupijoxiwul.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/719cfd1a6f5d04baf3631cfbd1ec302b/zifosofonulakon.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7ab4f41bd8eb8581edc1ebf9a357c8e/lubazuxufun.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bacaea299---85655847347.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/darejek.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a382d471fa---63080030220.pdfIn PDF document text
    • https://stopserv.ru/files/file/pujesabubowonibevasi.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720c2ec17e8---71707309910.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/23642700713.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/ridixamujofidetusabu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeab11b54a---tuligunisirup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=time+on+other+planetsPDF 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_off0000e8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BA 10480 bytes
SHA-256: 28e68c3d5a5d0c81bc01958e26be0580a5a9a30b3df1015738b339e9c69de05b