Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3195edbeb4398d…

MALICIOUS

PDF

89.5 KB Created: 2021-09-05 02:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8ca2e6181ca3c94ff6309ac1cd528238 SHA-1: a1a5cfcd43a03fcb8648991e64b7905726857e25 SHA-256: 4a3195edbeb4398d028ab38f7a7d1cd6f7e5581eddf35465bd4e8fb0c406a58d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The primary purpose appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://bayernglobal.de/userVZ//file/71307062389.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af9d40e2ee4---guwikudipagele.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b99fc2a60b---85303484971.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/pidijakuvezuregikuvi.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3fad4d508---41867738258.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/kajazulukaxidixa.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/43829834335.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/b71295jlgl0o1md3079hgeslbk/vanobaxekasiguloxo.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/9ko5bc5p9b2dif0f3mfp0jnjg4/95939854430.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7244bd944---tisopadu.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b973bdd726c---tegirujerirudebuwoje.pdfIn PDF document text
    • https://festacontinua.it/public/file/pepakezefam.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/37427806088.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/10333578056.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/3426157876.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/68458967217.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/90027481229.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/jubiwepiletizufo.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071a74bc0bd8---74983684242.pdfIn PDF document text
    • https://sapporopools.com/contents//files/dibuxubadorumijupowojebig.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/pd2dfrr7k75nqodn8vnm7ck8uu/zoponipozasetan.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/48343295004.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/29724797483.pdfIn PDF document text
    • http://soupworld.de/upload/file/59624519719.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/liduloxam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=teratogenicity+studies+segment+2+pdfPDF 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_off0000f322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF322 19220 bytes
SHA-256: e7c47af53380cec678069e27ebd25dde48a2458f297e89746a2ae25bb861b1d7
font_01_sfnt_off00012583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12583 11216 bytes
SHA-256: d73c7f9213dd8048d92ea909047681fefb6c5f4eab2da26ec0f8a28cd8892f23
font_02_sfnt_off00013fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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