Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cdb90fa4f719953…

MALICIOUS

PDF

85.5 KB Created: 2021-07-29 19:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a6800f284e9f229e34353c61bf696342 SHA-1: a0737d4b7b3f84fd66195f27e7e7a7f8e29d69f6 SHA-256: 5cdb90fa4f719953391bbbaf187489f2b5b34c4abd4ebcaa9a61148615ffa6d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or redirection attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddf19c73b5---xepuzenipuxomemig.pdf In PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/4099445279.pdfIn PDF document text
    • https://mmszke.hu/files/file/dumamewe.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/kuwisopeti.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/lixupetokageniweru.pdfIn PDF document text
    • http://houselandia.ru/files/37080787374.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/f126a577b5a6469f901a606bf8343596/zotegumir.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b88513b3ae7f32cc8267728c1e979b12/30776904568.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/jojolalilejedojata.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/patomuzejod.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/fubogabo.pdfIn PDF document text
    • http://dakmet.pl/upload/kerumaseb.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/2455701945.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f4c5873ca---63702503548.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8b9f5d177---27208887639.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7391924cb3---minalefazev.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/sagf78mkachv9rja9ggg1uuckh/95804084983.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/tosapilonibit.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/2c1195f0c6d1dbdf18ca156156fefdb8/96304418017.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/4109761432.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/93083111578.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/gefediwemilobobusiwatila.pdfIn PDF document text
    • https://kalnapilis.lt/kalnapilis/web/web/ckfinder/userfiles/files/dunomis.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/54236544834.pdfIn PDF document text
    • http://skncn.com/u/files/34539009837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cloze+reading+passages+2nd+grade+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_off0000eb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB51 10784 bytes
SHA-256: 5ef72a64d64e4463d0bd7094ad59559b5b83e881781af600332b5283dda449b0
font_01_sfnt_off00010418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10418 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2A 16880 bytes
SHA-256: e90e9eb54bce01c402ed472405e2e870de931da44b1e5f4a469d6466b92cab84