Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7c0513cedeb1ca…

MALICIOUS

PDF

77.9 KB Created: 2021-08-14 09:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b2a9c75f3f939454fd46f5f26d3520ba SHA-1: 7d18c86590f60e76d25250e42ac40112bb13b37a SHA-256: eb7c0513cedeb1cab00109677b7a2a712af0b659b4d91230e94bdcd866298633
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160897877e64b1---fapijesunixapunifok.pdf In PDF document text
    • http://vyveva.eu/UserFiles/File/11410424846.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d990f0bc911---85673662413.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/feniv.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/20jhunjkbqfh2bcg5v8eenifkl/lipalipixowe.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/xasamovevojuno.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/43027701044.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/pozoxasin.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/77416303938.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a21b8cef---rizada.pdfIn PDF document text
    • http://vodnik48.ru/content/file/divovimaxisukanudezosago.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/fesipilujugazuginugow.pdfIn PDF document text
    • https://goodline.by/userfiles/file/97061339444.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/finakumuvunov.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609499bdb9a07---sofinokerepeb.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/75725665039.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/15470650753.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/20418778657.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/jelipaletunogurerotavin.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/jeron.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b9709052c84b1328741e2f2f30526745/boderalelal.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/tetuxowixosowewo.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/vegukiwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=xbox+360+jtag+service+philippinesPDF 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_off0000ca52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 11560 bytes
SHA-256: f06596050ea52f6e9cd1d2db4dc8af32d5b3f280483137aaa1c5e48619ed8d75
font_02_sfnt_off0000fd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD91 16848 bytes
SHA-256: aa904caaeb1c0514b45534ad32c7db6adc56c98f20cf2e71a7eb63156565b702

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