Malicious PDF — malware analysis report

Static analysis result for SHA-256 df90dc0bf78b4a5f…

MALICIOUS

PDF

87.3 KB Created: 2021-06-11 12:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ba1e40b8faee79eca23dea30d10ebeda SHA-1: d62b95081ead9b5097051dbe7c9e19dee98684f6 SHA-256: df90dc0bf78b4a5fdeaff194b0f2e69086230b7227ce3d981ca4819c54a586f9
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-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 https://irlanc.ru/uplcv?utm_term=real+followers+on+instagram+apk PDF link annotation
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/97f17aae25dfdccdddeaedf7a8aba74a/zaxaj.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/bizafazujuzevonidegikif.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebc8bb9e92---dilegimuwiboveked.pdfIn PDF document text
    • https://bataretak.com/img/files/file/dizesumavenegukiwexegedi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48ff7f29c---12790482785.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/51073690260.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609645918a579---64281261011.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/mewurufukofomu.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/65169253748.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/ramusuk.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/2d94d94b0b7bda99a4fc74b40e5f12ce/91395346036.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e8801662d---39362905376.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/38705733154.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3433919736---kofejogefebefimitoju.pdfIn PDF document text
    • https://paperland.bg/uploads/file/39815969628.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/23646318204.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 5384 bytes
SHA-256: 2d084d8dddcd56422675d56a54b79203a4e0a22f51ead75513b8c640f004f053
font_02_sfnt_off000112da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DA 3948 bytes
SHA-256: b16da063a97bc308ea3ad4fe8c33912ee5a9e518edcf713ec40e760bd18a741e
font_03_sfnt_off00012221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12221 11144 bytes
SHA-256: e09680d42fefdfbf8c700b73acb8bbb3103c84e602b196a6f7b35b808868cb79
font_04_sfnt_off000147dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147DC 1736 bytes
SHA-256: 74be5bc4d46f64e5c506ae1006f7022dc98ebf960e37c7bf417c2027ca73106d

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