Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b3a1f8ade008ba…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 18:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f11714811c0573dfea1bb95817fac156 SHA-1: a7f275a3909657274c5a0fb1b669ba86b81d87b6 SHA-256: 24b3a1f8ade008ba9194e7d52f062b5c1528f778bc9277031a31858ce9813f82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm, with many URLs hosted on potentially compromised or disposable domains. The presence of external URIs and link farm characteristics suggests the document's primary purpose is to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mar3ol.com/Files/files/mixozalaripibiwakoz.pdf In PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/35955869392.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/doxon.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/vojovirujurolubugikifibe.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139b4dc85e2f---nogudixajemavujubo.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/suramojekebafikuwan.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/52008423723.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/84273723667.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/34048650570.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6a6879343---35770001114.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/sizepuvizivawaxozabe.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/55591007327.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109051213023528.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/subexirut.pdfIn PDF document text
    • http://arablift.net/userfiles/file/66022367083.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137fbc9a1b23---90443555570.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/67292168768.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091521040373499.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/diziserifilukoluv.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/33427233532.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/69008118097.pdfIn PDF document text
    • http://chikatere.com/Upload/files/guxiwufewezokaze.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/60492453008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=rlcraft+mcpe+downloadPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/pixavuto.pdfIn PDF document text
    • 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_off0000cf27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73E 10652 bytes
SHA-256: 17c877129590fa9eeb2b56414779f513cd6a73e59967f54fa46f5e11a7132ab9
font_02_sfnt_off0000ffb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB1 16780 bytes
SHA-256: 7f1679fbe3200cd9a52a9ae225d77c45c9fbe53f19e43bca76870cb9a4bc2fbf