Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e3f75a691641cd8…

MALICIOUS

PDF

89.0 KB Created: 2021-06-26 15:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a6cf4e413dfab23749b027ece5f31ec5 SHA-1: cdd1a2888bd57ad3828a4aa320f378ab53ecb95f SHA-256: 0e3f75a691641cd83daaf7073050995c31c5304795d641d2ed4bd56345b161d0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to potentially malicious content. The presence of these links and the overall structure indicate an attempt to exploit user trust or curiosity for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f056d1eb8e---nudigozujikapi.pdf In PDF document text
    • http://ascensionchina.com/userfiles/file/wobezodurivubujutopefij.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096798c5d01a---59775393801.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/04ca1275165f62103c262d1974de4bdc/42544522683.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/55d884a3b5b04d6b81b809665070bd08/dupatiroxavovenevesajid.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90e49f0c4---76722912147.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099169b71923---momitizipozizupikixev.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8db817851---37641571159.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/meserifatelukaxo.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/be74ba16f2b39c243b6dbe3bd448c19c/wakepufefapakefipuga.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/1a9lchmnk29co462jo4kck7h66/vakogetok.pdfIn PDF document text
    • https://atesolve.com/ckfinder/userfiles/files/bukovejutalumuvifibisovi.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/j18pm7vtjl53pin7ur81qikd7u/75150029541.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b09356f41---vunukesavu.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/xajeponi.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/da7861edf2de9ea3fa656e2cfffd1a8e/70926784279.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c324b81359---3983749793.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0085da6990---dejizuwimudoxofap.pdfIn PDF document text
    • http://splogservice.ru/content/file/povelaxomiwexarowe.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/toxisozokaguvosabeg.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/79732168675.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/3bd5e83d101ada1a534b044855f88a28/94699502369.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779b4e3f655---barajibovizotovaxusipadif.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/41085129636.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b317a01de48---pulafemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=best+words+starting+with+kPDF 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_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 10712 bytes
SHA-256: 90b4abc0c581481ec85f4e321cc3a74240ad8c8705b543cece6b2615d7fb1033
font_01_sfnt_off000113d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D7 16516 bytes
SHA-256: 6a88ce320a51000ed85d10ead9a91fcad7582d4024860c841f37255ebd7ee3ae
font_02_sfnt_off00013e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1