Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8b10f4c1faea38…

MALICIOUS

PDF

99.9 KB Created: 2021-08-02 03:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c013bda789966266a3d98937e34a0173 SHA-1: 1baf1d0346486210d45e5ccb55c8dafa489c368e SHA-256: 5b8b10f4c1faea38206a7de10919a5583a8b11967fd19f216f6c880b108e8906
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting. The presence of a 'download button' lure further supports a malicious intent to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://music-summer-courses.eu/upload/files/28734860978.pdf In PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/maroterate.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/wular.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d4bb7059d---xadesezuvugete.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c92792b2e5c---20282475704.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce8dc1356c---73584733512.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcaf215cff---lozosoba.pdfIn PDF document text
    • https://kawanmto.net/contents//files/47282584067.pdfIn PDF document text
    • http://lscapital.it/images/file/32618250614.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b41c4329d---82766443110.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/lixatuzeduxanoxan.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/lepevoludepuxa.pdfIn PDF document text
    • http://valeneighbors.com/userimages/lanulelurolekikikol.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/xifunofujoki.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/b3g3n2te160eotqgdac3lv1gn4/dipuveki.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/jcf1baij62q6lam7er60p5iqhe/36619310589.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872a6dd51a7---72037495686.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/sefigojusiwolos.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/giwumulozirefabox.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a881a94055---8049382505.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceea16eefb---pafoposakefupo.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/xobovu.pdfIn PDF document text
    • https://tavio.ru/files/file/98317621954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+start+a+dropship+businessPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDA 10760 bytes
SHA-256: 472336e1b66bb5f96bfeb66194317777a8edb8226b9a910d9324a3b003ff76b9
font_02_sfnt_off00015452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15452 17496 bytes
SHA-256: c7749cc65975e1136240748fc41075c39c5e1ed8612afcbc0a8d70ad2893b23f

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