Malicious PDF — malware analysis report

Static analysis result for SHA-256 de26bfaf9ae91c01…

MALICIOUS

PDF

98.3 KB Created: 2021-07-04 02:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 181df8228d0817f20b6cabfd066b615e SHA-1: 280f1ce85d4f36c6abca105c315dd74368194cf0 SHA-256: de26bfaf9ae91c01fc995429f25cf5d44dd465e2eac8a4fab9715f5621e2b309
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple external URLs, many of which are hosted on compromised CMS upload directories or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://askort.pl/Upload/file/tonakanodid.pdf In PDF document text
    • http://desagresbrts.com/clients/34568/File/balepebefoke.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/b68867591b20dba59f479aa068bb3321/lasateripunukuwo.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/81fpvppb5bag6l2m05rtkk8pkv/mibabulaj.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/mefanetuzadolofipijatenez.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/kalisaxuliruliw.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/91401619896.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/texawir.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0ea02cb8b---ropagukovoba.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/pedepe.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/pojoziporakibuvafivul.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ea6881c3fc3f5e8cedaaf244d903797f/51405956532.pdfIn PDF document text
    • http://heureka-cz.eu/files/ferakokomobojezevuzojiger.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d25bfac8---85231954903.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4vf89suuqfpi2eksv9ni4bl1h/mivomusokasijesaxetezaji.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/i2mvd8275k23d5gspsl8jfilhl/xanevusonodo.pdfIn PDF document text
    • http://temple.mo/userfiles/file/69664130923.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/3cf8af61c68bdc19eb2e9dece588e903/sofirilut.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b631d403e98---93228480028.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/jci6j764tndr0g4gbnl4eap6c2/jenuguxoxexanotefu.pdfIn PDF document text
    • http://aimic.com/userfiles/file/repolifu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078749349c3b---jifufefopoti.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/95797021603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=wastewater+from+textile+dyeing+industryPDF 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_off0001186d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186D 20112 bytes
SHA-256: f8d66999c218cd4c611a106bba44833a6977ce3c8faad36a379587e8ab17fcd7
font_01_sfnt_off00014a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001625d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1625D 11092 bytes
SHA-256: 0367609bf7910097a81fff8f2020977f0797c3724b63b7e551e9a55d398b8979

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