Malicious PDF — malware analysis report

Static analysis result for SHA-256 02cff93b82d63768…

MALICIOUS

PDF

69.7 KB Created: 2021-10-02 15:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f5c68a3fe826c7361bb0956604625a09 SHA-1: b7a13ad601b8b6cd07fc694760d885bc02f4d08f SHA-256: 02cff93b82d63768bc233001dcfce8dd7bcdd359b63c6fb46b93d2c8b1fa17f0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of embedded links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://seasonmediagroup.com/pic/file/76509225595.pdf In PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/rimarododijarazeb.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/bowodewizimoposewolexizi.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/madixemejijovijenaka.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/77672305354.pdfIn PDF document text
    • http://chieucoingason.vn/files/silemepumet.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/katugipizetedifo.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/0bc6cbedcdfe9c043506dee4464e0656/46468662523.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/wedowejofurowova.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/e5aa059eba93687a2501951f6237b7e6/90229738589.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161489f58b160d---bulod.pdfIn PDF document text
    • http://preiss.at/upload_files/files/vekoxarewumosila.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/539d9fc1e9639e67bcdf5f43e43d168f/bufafedabuwuwofizi.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/74827561263.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/41639016729.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/56796389931.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/zominepujoxa.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/96813747298.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/laxonibebax.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///3543569580.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/femavagi.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/kenuzazobibu.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/1bvgtn88qfsvj4q537eu32ln8c/gekojomuvube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=dsp+questions+and+answersPDF 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_off0000af9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9B 16332 bytes
SHA-256: c024207c6c82ac2d60d1c042e95358c4f132e3900d9a7d2f21f52549ce8a8c37
font_01_sfnt_off0000d8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F1 10672 bytes
SHA-256: a6f3fa2ef2b2c53d50d78212242cf040249174bd7d6771e97fd2fec9e4bdba77
font_02_sfnt_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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