Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ceba4ff67065a5…

MALICIOUS

PDF

88.2 KB Created: 2021-06-23 11:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f905a5e15751594ef35a8b5dd6aff1d0 SHA-1: 43cf78a27c76dc3197b667d13c5c3abb1c3ea445 SHA-256: e6ceba4ff67065a536eda745c2ed70b4bfa91303bcb3ad4a3c168df5c6173179
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting the 'formcraft' plugin's file upload functionality. These links host other PDF files, suggesting a chain of malicious documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608284ff95dc5---3668601305.pdf In PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d4a429c3e---5133566964.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/nb5ge5vl47dbekngoim15rmm85/vijaxonarusirav.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/47073717824.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/54653820572.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e3af6f424.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072baf35a68e---lojuduwadozojoweniv.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b422e915b---2161448794.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/811k3cbjmn7bfd3v8f40aujij9/wuvebevabus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811d09c02b7---guduzatotojipadumagomarol.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2495c2bef---72965671913.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/68161705567.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/fudisododibajuzusoborovo.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf2b40232a---fusebapagazis.pdfIn PDF document text
    • http://446888.top/userfiles/file/jakizorigafupefufab.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/19893482072.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16073fff362ad4---52518546708.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=12th+accountancy+guide+pdf+2020+english+mediumPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f573.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF573 12100 bytes
SHA-256: ac42f16081c17747376d0d9ae5b0cb496fd58f8f79b6ede94c14a039cd692363
font_00_sfnt_off0000e1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C2 5804 bytes
SHA-256: 462b6144589a22d4e7ee728511471a589aab3793be2a1b2b300c3df71b8ea00a
font_02_sfnt_off000114a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A5 11756 bytes
SHA-256: 1621292d9d1d690801f0de666ab09269c79a314c65698027cd9a3c01e56aec64
font_03_sfnt_off00013cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF7 16336 bytes
SHA-256: 7cd90a30898c54f8843ec7d85dd91a4019de35c20d4fc5b208e519b1f839db02

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