Malicious PDF — malware analysis report

Static analysis result for SHA-256 148ba9a9d1e3aec2…

MALICIOUS

PDF

73.5 KB Created: 2021-06-26 11:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9a4fd7396ad89c79abbba59118c2ea8f SHA-1: c227514f3e7907419185d298641172dba0b46946 SHA-256: 148ba9a9d1e3aec24a54844b7bd173f16ec41f8aa3709e299c81d940a9842a79
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories. These links are likely used to host phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • 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.
  • 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.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609498a42385a---13981699833.pdf In PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7c04224e4844a21436af4a1896462ad/42768866863.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/02fba038c90d6467d70b37ac2f1c70d3/8390613331.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/1d557b9b7ba790354e6c2ebfb541c20d/61408984532.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccb5d132de---50479703664.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/qbc8cc8luvv3cjl06lqq3f5l93/powuwabofozokukitosi.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160826798cf8d5---54246125782.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/20048765505.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/kupexajibevawuke.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2gkqgc6v3eam204g3uc6gdvlg7/8526565916.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081e44634a27---mawakatixisazategef.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/46011d03906d3b12b8c6bf11d74d34e0/230744124.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e5f215f2c---kalijepizitinipesadozawal.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/48199435347.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/7035a06134dc5d5ac6ae5d6753bf5e9f/46906237658.pdfIn PDF document text
    • http://coffee33.ru/archive/file/vowafamofoxi.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b6c3548bf---95442234722.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e38c59616---69942493518.pdfIn PDF document text
    • http://debden.org/userfiles/file/xinodofimovarun.pdfIn PDF document text
    • http://bociany.sk/media/file/90277684568.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/i4ph65pfdcs1tgddd90lh0p5u0/jebivimik.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ajonugo.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/0lbd9dke86jqg79afubpih4pij/dafunegesizekixata.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/orng0h1f8ndanirobhl2rcf6ke/kewozajupawajomizexejov.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a4cb5984f---xizatutajunidase.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079e97dd4c1b---6491158572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=from+blood+and+ash+ebook+free+downloadPDF 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_off0000bb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37B 10724 bytes
SHA-256: 63ee0b803b1126d9b94ddfe7dd592967c5c15688b594b56f987bdf44d34f61be
font_02_sfnt_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 17048 bytes
SHA-256: a5b40c0e7e030519a2ecf1f10a79a107ba6e4816b2808dd988522c345c162e6e