Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed71721ee88c7e5…

MALICIOUS

PDF

104.9 KB Created: 2021-06-13 15:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a4d5ab6f0c49237654ac62913d68574d SHA-1: a6ad5bb208474d45e077430ef526e27f3f8071fe SHA-256: eed71721ee88c7e53b74ab8643ba455ef8d8f157cf43d99c923306454f9b3ae5
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://catamma.ru/uplcv?utm_term=alienista+caleb+carr+pdf PDF link annotation
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/gqgjihr11t3t4otdfn2dfivcr6/mizofuvikalefuvodelinobi.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/47294815055.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a27c053cdfa---lixowolikisadamuwage.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/fa108941d64831035f45bfd38100184c/paxeduteweri.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097de813233d---kinaxok.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e7b5922f16298458e0afaebbdc7cdd58/xopefegidudemowudetiva.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e63aa12d6---duketoje.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/vawomez.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb6c1d657a---53703649753.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/h9m65vpfnkfr48thl3cma0qk00/43235991602.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3eb5347c47---lamabefofokekofuw.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/matudep.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/17539426070.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/fuwulabewazi.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/fh2pb6k9fn497sn7c07nv92fo4/modujif.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/df6800c9106a7a7cb48e6aa20d9305f0/90035834692.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14940 4956 bytes
SHA-256: 4cedabb92400c699cdd1f45be2e8a719d55119e507e3988491cb844aa5619e1c
font_01_sfnt_off00015a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A0D 15168 bytes
SHA-256: 407ce6c7e6181dd8e9a30ed59ebb327ff66bbb3d283f8f79ab07a2f05cb519a5
font_02_sfnt_off0001871e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1871E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c