Malicious PDF — malware analysis report

Static analysis result for SHA-256 becfa65d86fc5c88…

MALICIOUS

PDF

76.6 KB Created: 2021-09-04 00:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f4ff541493ffc7acadb600a8016517ee SHA-1: e903ad28d611cc20046ac1c8822f55f45a134554 SHA-256: becfa65d86fc5c8805934ce044139d619b64db14c138fc40a0607db72a0bb0f8
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and compromised CMS upload links suggests an attempt to leverage these resources for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infotechloyalty.com/bot/ckfinder/uf/files/60946477041.pdf In PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8387b9030---fikulebajuzo.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/5872c1dff48a66ed2c1c78860db67ca5/49579126819.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/bedageki.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/rivoratilininafo.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/xosavomakekefono.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/69219456453.pdfIn PDF document text
    • http://www.77ice.com/upload/files/16386247030.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/lezagepibo.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8f36b3aec26d1bae41f0d5d542955909/dutizesosibezopeliv.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b0eba7a0c---bugiwose.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/84310009971.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0556a4be---valitolujab.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912d6744c33---jigabomo.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/08c585037369339485a150bbeb30fd13/46226235105.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/640325765.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/vazawisevigurevelazapuj.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e98d4d77c28cfe3f5411bac00b68853b/30518735021.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfad6fcdab8---92280555716.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/29834194913.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/zejijamiwofigosi.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/35602894851.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/gelanobezipo.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/30117684768.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/cc22d253dcb5ac8281e5e710004f36bd/zuxijororulunapap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=exponential+logarithmic+equations+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_off0000c5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EF 17024 bytes
SHA-256: 3dd30ed0bbf21efdfb9fdaf84fbe23d1b27ece44e8ac7df6bcea1e2aafd6375c
font_01_sfnt_off0000f24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A63 11400 bytes
SHA-256: 74c41a3f08570b3f44a17a8a040d535550645b4724073a53628002b03ec6cff5