Malicious PDF — malware analysis report

Static analysis result for SHA-256 0524bc2853642b5f…

MALICIOUS

PDF

72.6 KB Created: 2021-10-02 14:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3e88d4cc70d08172cbda7687a31188f2 SHA-1: 54732a404c4011d37ef2988a1c2f60c4293c5c7f SHA-256: 0524bc2853642b5f13f7141bf99d0afe4b6ef19c85d7cb9c936fc8eb5601378e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, but the presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://carraracucinecomponibilitrapani.it/userfiles/files/55844163789.pdf In PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/wapegoxubunamidupaxa.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/vomewomuzafasubusoxasilam.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/40240130535.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161529413a7445---binasupizenal.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/poferozibugikufewud.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151bdb8a4e6a---wedopofoj.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/32168334796.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/dibolosuxoxukumidijan.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/67564922392.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/xosipabijazujexorosemum.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/64360177035.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/gozebuguvinep.pdfIn PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/5022932008.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/3844529404.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/69021937826.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/dbd0a95d30f585217f75ba5a64dad45c/gowif.pdfIn PDF document text
    • http://altinay-law.com/images/file/vazimekawuxoxuzamopamas.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/44233039371.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/7297828821.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/75982831237.pdfIn PDF document text
    • https://full-e.com/app/webroot/userfiles/files/20211001_030941.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/zejurajeti.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16158274329bed---97780749758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=parkzone+p+51+manualPDF 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_off0000b312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB312 18752 bytes
SHA-256: d2a1bff0f877ce4813c06fc53f51d10dc2783c37f87086862473acd90d22d1cc
font_01_sfnt_off0000e3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CC 10496 bytes
SHA-256: d56f52cc978f38f27b642941974a6b4cbef145d85e443f79f198d3c9ce0045eb
font_02_sfnt_off0000fbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.