Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a4cd9d3f101e33…

MALICIOUS

PDF

97.7 KB Created: 2021-07-26 03:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c5502b448eefa8aec632c0bf29cadd7c SHA-1: 3fd1767c43a4088e0d6708f00c7fcb0625ce6b01 SHA-256: e3a4cd9d3f101e33c5fae6297594df46fcb013d36e0a8f35242f348b4b524126
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of these links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.yoko-ono.be/images/userfiles/file/buneloxojog.pdf In PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/0749317298200530cffb34a5aed11b84/92569920182.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/03gvp0t5bu5uj6jtm7cnbi0d84/benolonadadojefokuzur.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c105d28e948---tojewuw.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796387525f8---zafulopil.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/ucmfpb973o3hsespl7epts6870/xinisegaxajobofuk.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/nipumupokupanusuj.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/jiraxivoxaxirol.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/38403446138.pdfIn PDF document text
    • http://tencanpowder.com/d/files/84017013742.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f07cf655174---lobuseko.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/95355306813.pdfIn PDF document text
    • http://jpcadonate.com/clients/4/48/4863a0bac697dd4b44f4a1b1fb44835f/File/1868080048.pdfIn PDF document text
    • https://bem-sa.com/img/file/tuxigudovobufubidulamed.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/31663211786.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/47639230815.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/56978902079.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/7220051481.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ad8b3f801---nugiv.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/gegifo.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/77419261697.pdfIn PDF document text
    • http://fsanaq.com/upload/file/21062017070840825288d53b6zee2n.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6c25433a5dd99cc41869a8646909a0c6/mutositibube.pdfIn PDF document text
    • http://midel.me/userfiles/file/matifijodoluluxijag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=substitution+method+definitionPDF 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_off00011a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A21 10624 bytes
SHA-256: 33730e6ace79c04ef18e2650553caa22ca2cab5772970057fa0e59b7c05fd4be
font_01_sfnt_off00013233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A45 17704 bytes
SHA-256: 4049f71adc051e14c8cc074334a975c89a75d371e677b4c6f738953d80735a1a

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