Malicious PDF — malware analysis report

Static analysis result for SHA-256 e530275432edd051…

MALICIOUS

PDF

106.3 KB Created: 2021-08-06 21:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5b4b8582fa7b77d7b4ec19ed0215b001 SHA-1: 3f317f6cc11549c7bb7e02ecc9450833dfc8779b SHA-256: e530275432edd051ad6ad3d5abf2dcede63b46c9aa36f83a34470bb6ceac36b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://mabuksusu.com/contents//files/kevaromiririsofakuramewos.pdf In PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2794bfda9---88156917355.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/foxera.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608017c4371fa---18016372377.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/67939805610.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa77fdab7ee---fujubizasoloxekito.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210525170200.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/xudikudusodomugabe.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5e5b27d09---16253970679.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/k3do9uetatp1vtvu3v9ihqojkk/jolezoko.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/97382123696.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/82749253108.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/926e980cf26ebe221ab37e9710b4847e/85961048869.pdfIn PDF document text
    • https://majubesar.org/contents//files/26696517486.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/24944846194.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/cmphte7rbfau5n2lf7hvt01dc3/32237878374.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/35987763882.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/vejido.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e48703a99b2---39644958180.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c395d19c82f---sobaj.pdfIn PDF document text
    • http://aimic.com/userfiles/file/90694275354.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/895a50535838ef0080720281827c1042/zavinomem.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/59501713187.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/e5e91c3b6198e7639ece58b9893b75f2/lipasibeluj.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c37252ba846---xizuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=geometrical+optics+mcqs+pdfPDF 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_off00013919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15130 10860 bytes
SHA-256: 39cbc7b2186b8fe5313ca6dce758236fc74274002e491dbdccd390f4ebb366f8
font_02_sfnt_off00016a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A11 18132 bytes
SHA-256: bfb6917f4fea5fe1e24695bf62b5386937839b4be1b9763f93c82c33bafb08e9