Malicious PDF — malware analysis report

Static analysis result for SHA-256 932d6ae063fa1231…

MALICIOUS

PDF

78.6 KB Created: 2021-09-21 20:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 790f1db48c612e222be6bbe559cff059 SHA-1: fc352440f489bef14a8875a09726efbf1dd9d602 SHA-256: 932d6ae063fa1231131393c64f41f711243aa637967ea7b19be658570f223895
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on disposable or potentially compromised domains, indicating a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the presence of a link farm suggests the document's primary purpose is to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://yuanyoujie.vip/userfiles/file/rolixozoposum.pdf In PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/pazix.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/bijaxereboxofopebamit.pdfIn PDF document text
    • http://chieucoingason.vn/files/febegux.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614225c84a2ce---vufimubanixekev.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/81474898173.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/vawotoku.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/nafar.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc0c31d5a---69972354226.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/dofozir.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/32198977907.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/53121576508.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210904_102037_9044.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/5036723355.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/27779541046.pdfIn PDF document text
    • http://cl-pub.com/files/files/xatubun.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/f1790e72450fa90e1c12632ee98464d4/soranafibijatawikawuxa.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/gixoki.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/juvodapuxezo.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/dexexemepowufofuzupema.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/jobelofi.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/rasek.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405f13346b6---suledufawujovul.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/42777451951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=123movies+chicago+fire+season+9PDF 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_off0000cc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45A 17912 bytes
SHA-256: 56bfe2a8f79e2b7a7b3d1e9e08a7b80f5354a5b76f2947a999bd067d01ce0341
font_02_sfnt_off00011311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11311 11120 bytes
SHA-256: 2588bd0c1c413097b98487c2c02297eeac9a36990e7d190e9287cce0b1ef78c0