Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8756de70332003b…

MALICIOUS

PDF

86.7 KB Created: 2021-09-04 20:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7543f3f2a7ba961a4179eb8da04b137e SHA-1: 61f0b2bd327eee0248e34f4610a2296d2e81d472 SHA-256: d8756de70332003b696c2581a803edd2edfd1e616abe12b51b256eb9896e25cc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to further malicious content or exploits, suggesting an initial access vector via spearphishing. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e196171b0e6---zunoxaneviwadalijusisefo.pdf In PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6d732f6555bc6dd4a60b947b30958908/73437778524.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608122f0cecba---rozepimededar.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/mojuveno.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add3f990e0c---dikabekolojalewer.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/21898555508.pdfIn PDF document text
    • https://papiratisk.cz/soubory/wadogukixilidowakudan.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/xilarimegofozobazodimigu.pdfIn PDF document text
    • https://cooperspick.com/files/19286668670.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c74f42d92---ruvuwudare.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/032ce5d07cc9c172295c0c3826163680/roniwujupigidimab.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/nimafudej.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/79095201.pdfIn PDF document text
    • https://mfdesign.hu/files/file/30540740668.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/saxit.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/aaa68e0914494b5baaa9657a9b577311/xofuwipaxofuruzegowuka.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/66390594628.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/e5c95171e21f3ddcab36f6bb08a32f66/vogekusisu.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/xipoxajiwan.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/wupapol.pdfIn PDF document text
    • http://olivia-mitzvah-2020.com/clients/b/ba/ba4af741f15bd7b6832e7848668b55b8/File/serekakapifafipazakin.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5c07020da---vidofudekezume.pdfIn PDF document text
    • https://expomediainc.com/upload/file/94228532328.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/norimovo.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/zivalofobuxomidemewir.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/59909420750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=prelude+op+28+no+15+chopin+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_off0000e6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FE 10904 bytes
SHA-256: f430ee06e5b69385fae467f96b2146e302e82f05e1b57180901748949c25e144
font_01_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 20176 bytes
SHA-256: adc54de00b88b0cf31878b483e6b95eba37b0dfbec12d6ac305bf127f6c89946
font_02_sfnt_off00013481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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