Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4375df3723c1fb…

MALICIOUS

PDF

83.2 KB Created: 2021-07-15 14:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 902f2d6e3f167e8b1097d9ffcef83ecb SHA-1: 3edc376f1fd7345f7a364ff57adaab5689b6782a SHA-256: ae4375df3723c1fb3849c2adfe7879b087e60541d3617b572d3cba3b4d6fe8b3
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. It contains a link farm hosted on compromised WordPress sites and disposable domains, directing users to PDF files. This suggests a phishing or malware distribution campaign, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4045

Heuristics 5

  • 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
  • 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://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/0e19d56dd24ef32212ee02aeafdb5f24/46668539073.pdf In PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/9e30b08994e2a9cfaf3f8e0629e3ab81/xopunilixobewofurawapadob.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/4a8573de5ee4d8aaeb18fe24d0e57489/72604213296.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/8tea0f2ipb61mnv98hhch4unnn/55279859145.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5670bb86da---zuwefedile.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7e280cfe---warike.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/525c1b8fa08fdac179192a7dd21640fd/44807099691.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/12119011744.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8299ceaf90---87286825554.pdfIn PDF document text
    • http://gptools.net/userfiles/file/16265207356.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8793d6a43---46361620038.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/32340494361.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/d3a4f6e14d0bfcf76ff8c9537d154181/fopepedo.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d9cdf6fbabe69255f2fde1738221d1ab/32223657876.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/kojawazobezovazejunu.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/90023340645.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/97550735543.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160728d88b7eb9---tagogelizum.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbce76cf357---9857884214.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/6a8d9f9092cfce0111a6adbbf4540574/24258190115.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/05e79abb7b079688ddafac504e8ab725/29364774764.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/sumofopego.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/73157063589.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609226ab143a5---22510704296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=abstinence+from+alcohol+meaningPDF link annotation
    • 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_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 16720 bytes
SHA-256: 3cbb1d2ea41c2f08a49d0b97a3e81e055236d97bf4c9a77ade3954526d97eb4e
font_01_sfnt_off00011f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001374b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374B 10904 bytes
SHA-256: 9cc0c824821a1bbe0fb25039bd1d0c1a8473242964ffe9cd5555f8bbd76ebfbd