Malicious PDF — malware analysis report

Static analysis result for SHA-256 04cdc5beb90856af…

MALICIOUS

PDF

85.0 KB Created: 2021-06-25 16:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f825f33e0ccd93a097e74af9997246e3 SHA-1: 46f5096e17b719fa71ea6ca6440f1c1e5f9b5763 SHA-256: 04cdc5beb90856afc0de041ca039ea071ac8cf208cbbbbe102916437fe1a35ff
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains a high number of external links, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of numerous external links indicates a likely attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://sardavetri.it/userfiles/file/37392159635.pdf In PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/tuseva.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/42535105703.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/pepinaragikarageb.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/37281602952.pdfIn PDF document text
    • https://tdfstore.it/file/12731700335.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/37718699735.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16070333e2081e---kitekofivafamatar.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/45101010333.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835cd64484d---dotegamonexurosotuwifimov.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/94cfcdc1a709c27ebb7fca74576fee00/gepujigol.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607107174339e---pisopapilizuzuletat.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f3a77a007---97381704273.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba796bd7e48---90601329299.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/tozadufanosapal.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/zodefetoxoperiwizovog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=anagram+of+citiesPDF 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_off0000eaa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 17200 bytes
SHA-256: 3ddb4bafafef4a407fe0947aca3193a89b33407ebfb362d0067f072fd2018a61
font_01_sfnt_off00011745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 10612 bytes
SHA-256: bb885554777675c6318979a52e09acbd4d5596dcf3b0813a9e1727056ecc7ccf
font_02_sfnt_off00012f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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