Malicious PDF — malware analysis report

Static analysis result for SHA-256 2804c0ce73c3d11f…

MALICIOUS

PDF

87.3 KB Created: 2021-06-10 03:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c4ebb7b0a5db1433f87060c74f0381fa SHA-1: be2968a42839befeea5ab0c91ae48b6abfdae116 SHA-256: 2804c0ce73c3d11fed4e44c30fac50c00d28797627d12fac65f75ec095ec6947
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://crysiq.ru/uplcv?utm_term=nothing%2527s+gonna+change+my+love+for+you+westlife+mp3 PDF link annotation
    • http://www.radanhorse.com/resource/files/80991287758.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/doblpcb0vd6vir4egu0oveaff6/65611606566.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/kitufapibakirinosemuseg.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160751bde241ea---60508768840.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/1d785414ba1683ceec574931a7025c73/27943078204.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1eb08047c---95393048669.pdfIn PDF document text
    • https://medtek.vn/storage/file/91595551781.pdfIn PDF document text
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/wewonogitirajidolab.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/lizexubolojepik.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c1308b743---25377338335.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739aef6661b---91495184271.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfac6cad35b---kidolewisafanukodazusiwol.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070830d616a4---golawap.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/luxevexuditivaba.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/67979399556.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/xukikolujupebavereluneze.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073678946961---64864247298.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021061007103370554.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d45f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD45F 9516 bytes
SHA-256: 80a4d60353f36be01fa08a5ba033ab988829468176a8f473cae99ed3fd687d72
font_01_sfnt_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 5848 bytes
SHA-256: 2a2cdd895dc543a22f8dbfe81a6ec466375ab0a8d460285b003ae3526a78c70f
font_02_sfnt_off0001075d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075D 5812 bytes
SHA-256: 3105d4b46358e4cb334796d22757beb84f34af005157099a55bd2048220729be
font_03_sfnt_off000115f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F8 9960 bytes
SHA-256: afb45acb7567f319c5e2da1abc72ea4a3674484c7e3dcc876c27f3e22d9dd4ae
font_04_sfnt_off00013864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13864 16396 bytes
SHA-256: 069fcc8b1cb703eed22fb39d324cf279d088bd3286de70fc4a0017c9f5bec8a0

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