Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cce5567f79cc660…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 20:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f1d230a59d295e0bb6ec3f3c2be2291a SHA-1: 150d9526ffc437c1368d8637be2e87411b969ea3 SHA-256: 9cce5567f79cc6606d8bf1566488d5b049ad4b6e3a4f25314cc6737b558abcaf
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The presence of multiple external URIs and link farm heuristics suggests the primary purpose is to direct users to potentially harmful external sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://archism.ru/uplcv?utm_term=password+finder+for+android PDF link annotation
    • http://naitikfashions.com/ckfinder/userfiles/files/xedimufusikefavobejal.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210910_808872C6DF88D543.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/dizimiwego.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/sapap.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/vuzovu.pdfIn PDF document text
    • http://d-innovation.com/upload/files/52613074862.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/24747866842.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/84d13089739f6ed0b31b0b2e4a8ceb79/61111536961.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/gogenodavuwidusi.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/vijazegibozegenamazepel.pdfIn PDF document text
    • https://southafricapools.com/contents/files/82501017839.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/rizewimofawatujazak.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/wexizevelefex.pdfIn PDF document text
    • https://shioturboapi4-xyz.com/contents/files/92168719131.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/powijagimejada.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109170402234751.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bea9a3c52b---8154303166.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ab795c1a56894f76489a4f4e59c062e/8292441405.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/pevisulejasemisegolesu.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbdc31829d---tezatatesetuz.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/63955167691.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328d243d3f8---zopokod.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/14251094078.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/lumaramuloko.pdfIn PDF document text
    • 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_off0000b080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC892 17392 bytes
SHA-256: 0428f125e3e3159ca104e7f7cb05792e55fbe74bf067ffe33c9bf73a7c0c3930
font_02_sfnt_off0000f52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52D 10288 bytes
SHA-256: adfdfc6385c0d508f3c5d4fa9028a13ee129e58954a168ff2c7da115e6a06672