Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9aac46ba26b2c74…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 12:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f70bc9e30d9569e91e50c47ad726472 SHA-1: 5e066bb9b7966b1b05bf06f0cc2b5eb4484ceb57 SHA-256: f9aac46ba26b2c74402b257dd60daaefdf3c10c636baba17ea3ee6a8ded9d281
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external websites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports a malicious purpose.

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 https://ekoelprom.pl/public/images/editor/file/bosupafamolubumora.pdf In PDF document text
    • http://phongkhamthienhoa.vn/images/files/rerodakakitowa.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/botafexowevenula.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/zelubaget.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/ramatewiwepewu.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/960118d10b38ea30dfd3da3221c1cdf4/magozudoxemojafowotedir.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614003c3f2808---lituxazezatabilogor.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/53530093583.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/runopinaweros.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143a83ad5da3---33786399171.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/91048192268.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/28094887607.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/daduxowazam.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7a8f39f2b---54892844918.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/bcad7c9d0dc1bffdb8b76a08eb4eba2a/derofesekeg.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bdc987a18---7443981835.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd56d7a29---43989555202.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-14/20210914083644902385.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/80433577088.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/95916845257.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161303f105084c---24052512817.pdfIn PDF document text
    • https://eternalbliss.net/file/fuxukobe.pdfIn PDF document text
    • http://myesen.life/userfiles/file/sibuxubovubusikaxazilibos.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/64572731387.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/51323720822.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/jujogopagibewutejapepiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sudo+apt+get+install+android+tools+adb+android+tools+fastbootPDF 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_off0000dee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE1 10988 bytes
SHA-256: 55ffe47f5ee4d3f3634370e7000c259932fed6d4c91d6584c1a9218755cb0aba
font_01_sfnt_off0000f811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 18800 bytes
SHA-256: 5695f3c0c102062859964de8c16eae4c83b19890220abd5089f02f4ee787e7bc