Malicious PDF — malware analysis report

Static analysis result for SHA-256 673690ca54c1a7ae…

MALICIOUS

PDF

77.5 KB Created: 2021-09-08 10:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4adde9ce3b8355a531eb45e98de16f09 SHA-1: 33e349d3d196648d15fd4ada7bad85c8f092fa17 SHA-256: 673690ca54c1a7ae8df16ab1fc4ba2117d97f0ca702aa171d8333bdccc304c7f
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites, indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. These links likely serve as a distribution point for malicious content, such as other PDFs or executables, aiming to trick users into downloading them. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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://birminghamseaholmclass63.com/clients/75362/File/84636163799.pdf In PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160933ebea082e---bowobipi.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/kefawoxabudibugukoje.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/somewu.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/lowigisanireg.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608524e2dde73---28170384896.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/raxomojexaxin.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/fevenem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97487e7c20---newedikuxenitixud.pdfIn PDF document text
    • http://mploa.com/clients/2/2c/2ccb326c3583e393996f575e36ee3974/File/23623979706.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/56175710205.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ebd9ccb9d3---lezorunovo.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/xovufononokuvozum.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/13536375236.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/80808597442.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/6639275657.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/57261127057.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3bb846013---pafizax.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210810215530.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/66402215676.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/faxegebagonoxu.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/58686623571.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841d3978253---fivagekokuwedom.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/vurejufefizuxikeja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=shell+moulding+casting+process+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_off0000cb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB57 16784 bytes
SHA-256: c6c4ed8da56c683052867299b3f76bf0e50b57636cdee22b371c5e0e29223df3
font_01_sfnt_off0000f699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF699 11244 bytes
SHA-256: 464dad180e23f62ae0299ac6bd34bc6a07cca8a5aeef7a93b669470786c76121
font_02_sfnt_off00011088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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