Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cbddc93c989800…

MALICIOUS

PDF

82.4 KB Created: 2021-08-23 15:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9053a6e477a22d3578785520c09aa614 SHA-1: 4b148f0250854fc031682f7be723100702637280 SHA-256: 18cbddc93c9898002c99cebe8b9bc09a9db99333d69fa4ad17ed44b627edfdf8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The heuristic firings indicate a link farm strategy, with URLs pointing to other PDF files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://smidgel.ru/uplcv?utm_term=purposive+communication+book+free+download PDF link annotation
    • http://proclima-membranes.ru/userfiles/file/59913511348.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/41f48dd241cb58e803a5069c01a77768/62083921469.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/vonamorajoraf.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/a74390a12aa2ab566afdc15ba11625e7/73652238613.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c293be98c12---87561771888.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/56981635963.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/401ad2fd63e296391f0fa2912fd91ab8/pizejoba.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/tojorikerol.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6af72a86d---28634534109.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/jolufivutexolux.pdfIn PDF document text
    • http://friulanapanini.com/images/file/sezebanadiboda.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ee2fbf4484fb1dfbee98c7f5760786a9/kewomaropazikirewusem.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/tobawifotatowapezodi.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607f765d05e0e---tokotululupafutusisagumoz.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b75046cdcf---fumuzuxomosik.pdfIn PDF document text
    • https://badrivishal.com/media/14197652146.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/32174196752.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/favn6tsomomhjesuvahcng6gm4/vabozok.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/ruruguk.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210812171758.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6b3e8c589---3593664254.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/11411893694.pdfIn PDF document text
    • http://lhjmfamily.com/clients/5/5d/5d8645f74963a96e1aea25f3b610eff6/File/52659226030.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_off0000ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 11268 bytes
SHA-256: f7ab253a49a8799324a7ada6d0027442b6077c899f6b6d0c2cbbb3797180fe49
font_01_sfnt_off0000f810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF810 16540 bytes
SHA-256: bc275a7881ff4e1185bfde6d9371c490083ad60a35b6196a2e95bb12f0e23d0f
font_02_sfnt_off000122d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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