Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8c69fc0e4a7196…

MALICIOUS

PDF

84.9 KB Created: 2021-09-04 23:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d0581025b3ae2530900d7c747489551 SHA-1: 93326954dd3a98177d41449c362cd17eabc351fb SHA-256: ef8c69fc0e4a7196d5ccefda0f25aebcaebdf527b9fd99ff30518d9a56c292cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous compromised websites, likely intended to trick users into downloading further malicious content. The presence of external URIs and link farms suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://allytemp.ru/uplcv?utm_term=download+khutbah+jumat+nu+pdf PDF link annotation
    • http://gmkms.net/upfile_editor/2021/files/jefozigijimizif.pdfIn PDF document text
    • https://wita.lt/images/files/limipomifebizo.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62154e07d2---39174940238.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/78525265779.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/be24j1mcq32b5rji74bl6j4ub0/91443379730.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/28478232106.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/94433201004.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/51749205667.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/bifunomese.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/21811769853.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/lemamupetosomijazerox.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/limibupekulonebilaso.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-12/20210512160925217008.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16099a07863467---zemegidemiwuwatifipejepa.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/begegusefugapit.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160871277a4586---47483348260.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/kofafun.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/84363573191.pdfIn PDF document text
    • http://modern-pro.ru/files/file/77887822399.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/16baff7f949a85e1205608e318276be7/92611557004.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b379c1835---nepusetox.pdfIn PDF document text
    • https://ikima.fr/uploads/file/61603008070.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccfd674f9d---38512821771.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/41081555558.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/xavanugajiwofaxepib.pdfIn PDF document text
    • 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_off0000e05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05A 10820 bytes
SHA-256: 37450a17f329e5c5fab7ded4efddf8a76e54e5e81bd581587ca0c5edb54c873f
font_01_sfnt_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 20428 bytes
SHA-256: 042fe31a6b3a73edb1fe05e1e2045a64f471b8f689b3a5c8223f2b4bcc7fbcbd
font_02_sfnt_off00012e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1