Malicious PDF — malware analysis report

Static analysis result for SHA-256 912fab208c061c47…

MALICIOUS

PDF

79.2 KB Created: 2021-09-22 19:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e0087cdc5e8c15d3561bb1b12c76416e SHA-1: 831351204da5b83cf8f4f69bd00535faef429ad7 SHA-256: 912fab208c061c47bbd0b55ece6c55d44f32d0ea44f03408f12aa525272c88a1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely contains an exploit. The document functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting domains. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://spielundlicht.de/content_provider/documents/files/96165373796.pdf In PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/151754569247.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/37b7f47f51331446502683fa136a85a3/38620021051.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/mepejetawosenuworeban.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/bf7b01139b387e1bdf16fc1bfddc58f3/28040647183.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/23228588108.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec0fdc4c90---65981800553.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/tosezikenijodejibu.pdfIn PDF document text
    • http://beiks.info/public/file/8830168412.pdfIn PDF document text
    • https://micsys.in/userfiles/file/ripofeliparixosizasipunu.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/topuwoworimisegapagexuwut.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/nituwivivikif.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/95461592246.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/kalarabafozajawaj.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/94qchu3guu77lru3f841qvlv9t/44193881159.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/23130864218.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/murerigupiluzur.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/61310070996.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/gadakem.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/221655219874.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/79427593757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=you+are+my+heart+and+soul+quotesPDF 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_off0000d2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A5 16924 bytes
SHA-256: 90f96b65da6aa3afc97ae7d8817041911c32f2cc3fe4016d14b352c9d07f710c
font_01_sfnt_off0000fe47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001165e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165E 10764 bytes
SHA-256: 9ebb2c04d25058d68594dc82783f544adc972a8222d63d6a065c74f500644add