Malicious PDF — malware analysis report

Static analysis result for SHA-256 9834c1d4f32bcaf8…

MALICIOUS

PDF

79.4 KB Created: 2021-08-28 15:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2cfef6ab81d8d0440543a3a348bf9371 SHA-1: ff1b09166581eaf1b6fc284019668af2c0fd35ff SHA-256: 9834c1d4f32bcaf8c277877b89e96709f11423c6e22d7f241c467fa8c263b525
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious domains, suggesting an attempt to redirect users to malicious content. The presence of these links indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d56ff43a5e0---90288828232.pdf In PDF document text
    • http://arniuniversity.in/ci/userfiles/files/dapimimumukewuwiwi.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/jegadigewadufovubaka.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210826165853.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/8536339821.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/15353989281.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a45791059d3---71603671672.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/aua0p5qle7g3hg6bsc8bpn64l0/fimemapabesobikajo.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/46282715389.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/gelano.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/nivoxirexifodiketixobi.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/velevuw.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/9ac64596eca31c2e4cd1d3b016a32b28/fusiparagusa.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/15028577681.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/pobenifuwimom.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/16547616234.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/90680337770.pdfIn PDF document text
    • https://coatielectronica.com/files/95966814837.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/36400665841.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/il24su993dnuj3h2e63kk8quo9/bibepofodasarivako.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/re2ruhl8chdmol8gprfqk0ml3g/43073334752.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/viketove.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1642ba2b19---68762064020.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdbe16f98c---18460907192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+find+a+sampling+distributionPDF 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_off0000cd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2D 18568 bytes
SHA-256: f35a90a73233cda7b4447df82f8b0a9198279f37553e70fc801fee72ca8cca63
font_01_sfnt_off0000fd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A8 11024 bytes
SHA-256: 8c46aeb41677ea91801c42f72bbd075892b32cccd066f2b6bc591f362962e902