Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad318b17e877c7e0…

MALICIOUS

PDF

111.9 KB Created: 2021-06-26 22:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: dfc6efdcdfea83e2498c427451c46a7e SHA-1: f814a2b3d934dc5612cc5cd19c6825d729b279ff SHA-256: ad318b17e877c7e073bb7b71e396c5b067e0ee17922c0b1860800b5732ad2b46
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations. This behavior is characteristic of a link farm used to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9794

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e90dd40e6a---fusilefekisemisuzog.pdf In PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/b923deb117438f6104cd93ec0c03d9ad/69523502142.pdfIn PDF document text
    • http://rotang.net/userfiles/file/95919784546.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/6fc34715b29692336507135634377cdf/91702552987.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/gopupilujuxariwuvirif.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/27227551406.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160841ace44bb1---65345145079.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f40026e58---72099584132.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f8b11f27---69804606986.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/50224762296.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160872d6258922---ruwowosawavopilofol.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aba97e172a0---sugabede.pdfIn PDF document text
    • http://sparkpro.lv/content/file/vunisumesigofu.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/amp4ibumks6ivis13f7id2ukqq/timurikuk.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/55343112722.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/80700411848.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210618_FC4067F2EAB4F50F.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b52c6ddc5---xugowa.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/520e4e426cc62f0f63e758ce9ee39017/3301626833.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d11fcc53b---68049349837.pdfIn PDF document text
    • http://amajyuku.com/files/files/begetupe.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/21539856157.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///42981517522.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/j32jq8khkn7bs2qub6o2f3nk1g/bosurojorinutuduvafe.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/gugodivisarefesovamuko.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/15863617550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=principles+of+hospital+administration+and+planning+pdf+downloadPDF 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_off00014d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D28 18740 bytes
SHA-256: 7107ec75e4225b5be67f418bd951612586eef63a990d230ef981d302f8fce71c
font_01_sfnt_off00017d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D95 11156 bytes
SHA-256: f3d6a5999cdd104e39ce48756bc6bb3534cbaa396d128e65f6a549b52f40b5df
font_02_sfnt_off00019749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1