Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb93b59bc886dd6…

MALICIOUS

PDF

79.4 KB Created: 2021-08-25 04:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3fc8082397cda7a0c60cc1cfd85c91e9 SHA-1: 8d6ee37fad1337063f42d5d034fc425fe7166994 SHA-256: 4bb93b59bc886dd61e3d8e41ee319fd49fa44055dea5c51f1f1cf0b0300b4ad7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many hosted on compromised WordPress sites. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates these links point to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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.
  • 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 http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fd2eb98bafc---lerurawovo.pdf In PDF document text
    • http://rocb-ap.org/file_media/file_image/file/vufoju.pdfIn PDF document text
    • http://adveotec.com/img/file/52601646553.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/guojsgh5la4ssdu5fa42qme6d483alj6/piwewugumutulevejotokila.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4e08ede252d05d6d0184410e319df8a7/ruwunagovuvodaliparedulan.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/2eb967428a48531d7c897dbaed522d1d/kimutegonav.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/norenanuridawizoxufan.pdfIn PDF document text
    • http://www.pilartangguh.com/file/91951515084.pdfIn PDF document text
    • http://yanartextil.com/firma/files/vuwirup.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160c655a42bb4f---gijasevovo.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7bb85fd08---9891047250.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/40824446864.pdfIn PDF document text
    • https://ketoandongnai.vn/upload/ck/files/84245281402.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084882a007d1---14045731017.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/krqfd82hpl1205v2i8es4k4fro/75809918324.pdfIn PDF document text
    • https://digireg.com/upload/bokapajafaro.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/1a3eb1459d2b7641644a8f964904fd8e/10064888996.pdfIn PDF document text
    • http://xn--22c6buakeib3ax0bzcc5b8tlc.com/userfiles/file/55182419311.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/3s3kd49ific67ebiiri3ajo070/tanalut.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/mebezabizudej.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/39269185238.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/9d9dbede4ea8e5be106ad2ab8123b775/zisanexu.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c1b76fcb3---ragavopufusuxexezufol.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/jigusosiwaga.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160afcefcd87e0---pimebivubosav.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbd253398b---solezutetewebureronunuzag.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/29274187410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=poole+to+cherbourgPDF 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_off0000d55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED70 16356 bytes
SHA-256: 54ec3a3c080a02d91c270d0d83f8d4bc95cca083ac7d1a78563d324f7f4ee27b
font_02_sfnt_off000117e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E4 10224 bytes
SHA-256: 89e7a70b60c450ffb7aff11fcbe18e59aa679afef52f8cb0e76c33199e52996f