Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad96133aed84e107…

MALICIOUS

PDF

98.6 KB Created: 2021-09-07 07:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d9a4a7a4ee27a5353a928afa305832e9 SHA-1: 1dd2cc474c3e1bac1508328e902723493769e682 SHA-256: ad96133aed84e107bd38ad61feea64b13d250cb699e5fd68fbf1e61e1e483865
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cf7bb28ba---zesirumadora.pdf In PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/88ad0a3e3d377f9ffba757f0af44e7b8/nivuf.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/44126798428.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/88547640076.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/n128sfqg8lkqqqopuk47qd467j/80932877408.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/71165300387.pdfIn PDF document text
    • https://t2sc.me/userfiles/nokezomulirofazujabu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160703b9a18c58---51056642541.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60bc0a3a5ae53.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/xipakojexiluguvalubid.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/6458118f6a615bd933bae1bba69f2a9a/dukujesusilaxapomolokaw.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/xakowupojozezafikutivowe.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/45516572402.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/itfi2p64em092e0kcpr1tifnv5/95549877632.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7dukedfepn7gm5nf808d64sj10/napekilifisi.pdfIn PDF document text
    • http://susutour.com/userfile/file/27314204180.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/e55735ca90a401ae7fe611aaeeaa5d7f/33765342670.pdfIn PDF document text
    • http://ridendo.cz/files/file/29055705754.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/760a4ad942cc810c54ed0a5da969ca28/29323438045.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/9759546611.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a125511b7b5---xikudegavetuxutiw.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/gowil.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076ce36c6272---pulodorumufazafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ktu+s5+eee+syllabus+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_off00011e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6E 17748 bytes
SHA-256: 8b9a00659ec1e0bd640e72e0efe1597dcea91c02ce36e8b899a46765ea9960d1
font_01_sfnt_off00014cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CAB 10552 bytes
SHA-256: c4d713ab11ecd152becd5e6a43f4a13c9407790dd10ca33f0b09521655d09cfa
font_02_sfnt_off000164c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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