Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a0f76c90e1477e…

MALICIOUS

PDF

79.1 KB Created: 2021-09-05 05:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ecc6cdb00da492af11f0a1cd775851ac SHA-1: 228d8b057943571dc42a9ddfa026ddfeb33824d7 SHA-256: b9a0f76c90e1477e00e6a1441b1e53ee79b814afa31de2c5bfc826f4b12d5bae
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to open a separate, encrypted file, a common tactic to bypass gateway security. The numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggest a link farm designed to distribute the final payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://jtipartner.com/ckfinder/userfiles/files/nadexobumujebomajupozozuk.pdf In PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608395c06ea81---vemaz.pdfIn PDF document text
    • http://mp-journal.com/media/file/72970400092.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/vawowufemutalutumapigo.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/70355457392.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lifexifezazukuwu.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c652ed495---fonowaxibikozaganevuwe.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/90135062047.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846ee0925b8---nekujopumopiwutelafa.pdfIn PDF document text
    • https://egca.fr/userfiles/file/xilipakarozek.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/84370273593.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/55059525061.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/59479738539.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/45079458864.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/4195549496.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/68509854663.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/sidorubilarijemiwowusig.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/66517002074.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/42f688aa381cda42f4594dcd2a7afb88/pibagi.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/86180554751.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/l4tdbfdlr4hqcn2pn59jfb07b3/52703485506.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/94999764637.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160dd79d520571---wesutilokifegorizi.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611d16edafd67---mujuwogip.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/1767133323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=esic+udc+syllabus+2019+pdfPDF 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_off0000cf33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE745 17968 bytes
SHA-256: 1feed9551f5863a50474c906219cfc26b1d9baf5dc01bfba65c038987c66d4cf
font_02_sfnt_off000115e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E4 10860 bytes
SHA-256: bae9c82a7023ca4ed5d83db24f6fb2fa2b540694e77886fe6337e1470389460d

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