Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea1896398ec508c8…

MALICIOUS

PDF

74.0 KB Created: 2021-09-05 04:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8920150b078efb4527b4042d78e1d1b1 SHA-1: 0f66bca3427d58a0c38ac296bbc7be707a935e24 SHA-256: ea1896398ec508c85233b23f5a230922ac1e8fa62d43b63f98e2c66a582b0ab6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to a phishing or trojan delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://abnicum.ru/files/file/fijulugoju.pdf In PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f5e4041db---18842430237.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/11647054285.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/wuboxijav.pdfIn PDF document text
    • http://kotolantopeni.cz/file/dusubalapowidifulekufigul.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/42413576516.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b16c07670---pogiwizidomasuwovofibuwuz.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612c3808b3632---92690939228.pdfIn PDF document text
    • http://landpas.pl/upload/file/27999088812.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/67656556409.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/sivesudiwepipelefonefudez.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/vilabuneduzijivuwe.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/3d8512f204d1137d419aec87301bf422/bilalupunek.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/m68hv29de0l3i0nus0rp0o27ke/dupototezubudilab.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/58294402613.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/saxigofus.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/a08f1748d4bd4dab76483d135eeab95a/80555642938.pdfIn PDF document text
    • http://ddrwc.net/clients/869849/File/xexavoni.pdfIn PDF document text
    • https://stopserv.ru/files/file/40296862226.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/1a943uu77sik1nqagf36cg0kr5/22155817391.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/35924055016.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/wogajoxokiwure.pdfIn PDF document text
    • http://chinahongji.com/d/files/nelusuva.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa25b85e65b---19339184312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=equivalent+fractions+worksheet+fourth+gradePDF 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_off0000bc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0A 11228 bytes
SHA-256: b95bf4e3a71854dca280212511952f4df872ee224633da788b15248e2736c3a0
font_01_sfnt_off0000d5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 16644 bytes
SHA-256: 14ca8cdb72599dd179c63037fb124e0e1e036115e80e750633b07dcff20cee5e