Malicious PDF — malware analysis report

Static analysis result for SHA-256 a149800d71edbe4e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 02:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef0c452c95e7fb5b6f82be9be6bf05ad SHA-1: 22a8840666eb5a1c90c9a4c7960a35d09ab4cd60 SHA-256: a149800d71edbe4e35e3a090a538140901c433f459c57a25ecaa2f61bda064e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/i3p0qtrqq701uvhhnsht1fsv9f/namusulajewexikeje.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbbcb2600d---47022495586.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/vewuvizunelaxetubibupup.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/55881529149.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/112bea3d4c0c6c9205f257a80b047272/15571229139.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7f24a983403c9ccdef858f7b59058d0b/27966025966.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/8714662886.pdfIn PDF document text
    • http://caramelitos.sk/files/pisuwekotuwexalugozumi.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/wifiwoxazalasa.pdfIn PDF document text
    • http://hongdacable.com/d/files/rusofexiwipexotu.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/nodawevitovabapugolawup.pdfIn PDF document text
    • http://mopron.ru/upload/files/noponado.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/4a58d3383cfdae61bf1ece781d5973a2/43279133988.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb3ea62fa1---61482948622.pdfIn PDF document text
    • http://laduses.nl/image/file/31271346667.pdfIn PDF document text
    • http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/pumojotedelenirevonep.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160faee93cb929---34076745069.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801f8c4ea8a---829246639.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/79323263812.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/dufaromot.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/mekilulipasigazivox.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ehvd2cr0oga9nolgrifs5clh90/27623307320.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/lijarizofivesaluzopeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=itextsharp+xlsx+to+pdf+c%23PDF 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_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 10576 bytes
SHA-256: 9c67518e55b7794d50c50c8e685398cdcaf9ac11710ca761cfc175427f262bf5
font_01_sfnt_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 18120 bytes
SHA-256: dc3b0e83ac069f8dc3ce9e105b2c9d1af2b85076e4990ebea77669714efcdbcf