Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43e7249d88c8e00…

MALICIOUS

PDF

160.0 KB Created: 2021-07-16 00:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cc454a03d349679624a0063c6120ff7a SHA-1: 77f37e0c3fec2d52718077c728770fff47af049a SHA-256: a43e7249d88c8e00cb40821390d1d7a061542fc058e1e6a865a003ec1d4e3ec2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to manipulate search engine rankings or host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c864bc13684---defovidonugogefupaxus.pdf In PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071c313d337b---20512355704.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/15646531677.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b0527982042---25270291359.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/t5m589li147bifullhijrmucsd/42548095017.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/guvaxixe.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea0f7a8a0d---57797012829.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5aaa65d3bb---wixuzo.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/61756354235.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/8955200895.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16077e31914cf8---30011591320.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/58582306888.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67d4e00693---kugabisojinaru.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/sumefokosipabivefaxokiwi.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/5abc4804ed29b2a20f0d85af1b203190/tezigibavetimeripino.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c40febb1f39d841596a8f83a48ddf757/motuz.pdfIn PDF document text
    • https://kildevangen.dk/files/54120786191.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/2i091h1elk0kntds2od0q8sjs9/gupuzezexivifolawitema.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7ec34d4f0---tojolumopobatelozaninew.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072d09ef0b9a---gelevopugezisoluz.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/15645580245.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/buvasutitufuvoxitabav.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/57531133998.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a9404b4eb---28278625453.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/tizudulir.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3adf3248e0f52b00e10c68ffba73bdb5/54553734455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=formation+of+medical+termPDF 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_off000211b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x211B1 10444 bytes
SHA-256: 78d3129cb9c0f9b5143b63308817546ab49ece2d5aa5d85664049d206fede375
font_01_sfnt_off0002294c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2294C 18700 bytes
SHA-256: ff6734582a34aa33e86114cbeeec45a55a94ddcb697505623395767c08bedd3d
font_02_sfnt_off000259fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x259FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1