Malicious PDF — malware analysis report

Static analysis result for SHA-256 9016dc9c1081167a…

MALICIOUS

PDF

85.8 KB Created: 2021-09-08 10:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4c608bc4fc7d8f23705a42c51e3f8c39 SHA-1: 26ba65503518248ef3e70d4334ce5af3cfaeb9df SHA-256: 9016dc9c1081167a363151bef9037ff924d12a5528f0b6bf36cbba8b70984f59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous compromised WordPress upload directories, suggesting an attempt to host or distribute malicious content. While no scripts were directly extracted, the presence of external links and the overall detection profile strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fe38037b1---pofijigojewafure.pdf In PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/78245798002.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/topenek.pdfIn PDF document text
    • http://ridendo.cz/files/file/zagupivutikepikijasevokil.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/2vr40d0enr8no0erdtdl7uc8pr/xikuwo.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/91460514428.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a4da25cf2c2---posusakubalotu.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/66220658914.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b61013d1b54---75692366767.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/3878706931.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/98643330208.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/80236837507.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/xajinozipivobalujogo.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/sujazurenetise.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/86994317969.pdfIn PDF document text
    • http://namdolove.com/FileData/ckfinder/files/20210530_76A0DA640569E565.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/42f8c8653627bf82da104bb16cf4d1aa/sedugot.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/127g0pcu6ilpoliv2q9cjfv612/jinuvejokobeda.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612d6f8f4c1de---52662458295.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160f0fa81c9a23---ropisagunowofebaz.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/27244031554.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/57696fc5532f22813d52e6e771eea0fa/81270208650.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210810103009.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/befa75ee7c82e1af0a96b9c58ffaab62/99534828802.pdfIn PDF document text
    • http://asustainable.com/global/file/12682348112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=casio+fx+991es+plus+calculator+manualPDF 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_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97C 11096 bytes
SHA-256: b3303ef9b6087553e9e442b0b99952a0fce77b45fa0c92ee962c490f0c35bf8c
font_02_sfnt_off00011374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11374 20544 bytes
SHA-256: f1fd6db72e31ae72d93241f13472e3bb5d435974afcbd5223cd697b6ac067f69