Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9bef1e67dbd925…

MALICIOUS

PDF

70.9 KB Created: 2021-09-30 10:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f5bace4934086613b8d597d09a35a971 SHA-1: ecdff81ec25461d440d2f3c6ff8d6e395e3a9397 SHA-256: ce9bef1e67dbd925f7935cb2873587e13097e840541ff07ddd8d34f06f324403
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple disposable or compromised domains, which is a common tactic for phishing or malware distribution. The presence of numerous embedded URLs, many pointing to unknown or potentially compromised sites, reinforces this assessment.

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://consoles-a-gagner.com/fckeditor/userfiles/file/xabofiremuwojofukeruseva.pdf In PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b2299846b---28064169648.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/mazabezenojanaxuxakuw.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/71791966617.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kejitomoxedepuxajiwuxaviz.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/69671290041.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/tajis.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/mexatepini.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/45383363518.pdfIn PDF document text
    • https://12shio4.com/contents/files/migabela.pdfIn PDF document text
    • https://nesbedcollege.com/singhania/downloads/file/gefutaredipuxob.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/67225431619.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/jalogajam.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613982f89bff6---93374927561.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/cv9i7on5jhebahtl804kgqqeen/filetarejivexetobop.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/nemubisamu.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/62358934430.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/70165242249.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/88747136754.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/75702950059.pdfIn PDF document text
    • http://sksound.com/userfiles/file/23467586774.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9ce894c0f94943fab36871073de1e09b/6981417984.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/92825713990.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/16416143956.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/surefewule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=auto+clicker+extension+for+chromePDF 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_off0000b491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA3 15340 bytes
SHA-256: ac81e9046883a5bd3fee7197ed620384af15de0513d472df44394e352d6e82f9
font_02_sfnt_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 10716 bytes
SHA-256: 6abed41960d4cbfede2b1d5025008c083ffcd33338893a40b9e62dccd325543e

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