Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4eb54d221b0deac…

MALICIOUS

PDF

85.2 KB Created: 2021-09-02 19:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b7ec87c74622aba7408783a2349457f0 SHA-1: 557699e2a4df0f2572aa669dcb163d803493f691 SHA-256: a4eb54d221b0deac9883445b9d696abd44a7732cc644d2fbb6d57bc3ac5d5bbb
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the final destination of the user's click.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cda081058---joritasujitivarifinuvax.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t7546jki7pbs81hpr69k70dm04/jagamofanopu.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/u9o8rr7aieamgnlpkkovn0skhj/66815380791.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/56256084479.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/98765574850.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/gutoxo.pdfIn PDF document text
    • http://cortabellanews.com/userimages/fijovozazomo.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/gemesinotoredemapikuxo.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/3253082769.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/silopuluw.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/3868335654.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16070b853ddfaf---29290086667.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/4334cf4c75bed6cf43460c77f59b22e6/12029429152.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/17044469763.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/33563978868.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e77182be6f8714d928e4d623a13ae25d/63096814127.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/zutejesawofijilibefedewuj.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/lotitiro.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/2725399308.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/1022707962.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/45659327974.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/fimobivosopejexupupogoka.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a846b48f4b4---98695363313.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210822065941.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d05b39c11---gugivis.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/57380975857.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/1cuuj9uf9ckkrn3343s2rf9kg4/5614174834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pdfmake+createpdf+documentationPDF 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_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 18000 bytes
SHA-256: ad09d3b44fb53cbc7f5ed9fc7f8ae901963ba22336d3e20ad28a9b74d1aac065
font_01_sfnt_off000114b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B5 10760 bytes
SHA-256: 0351ec9796a711dce2bd0acf3ef6ba030d2dee8ca86bbe7699541aa8d018c4ff
font_02_sfnt_off00012d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1