Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc89828f0f34fcb…

MALICIOUS

PDF

77.1 KB Created: 2021-06-22 22:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 3b6a112f954b8c5334a40b337899da01 SHA-1: 8c845772c641f7e8c83e3c7f800650268ded9e0f SHA-256: 0fc89828f0f34fcb08b18a5509775b444c25c00159a07fd6156bf26c4cd83153
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, appears to contain keywords related to educational content, which is a common lure for such attacks. No scripts were extracted, but the presence of numerous URLs and the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/uplcv?utm_term=cbse+class+10+maths+probability+solutions PDF link annotation
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9a3bd188163e0fd329998cf98d6c83b3/10002415934.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/01maurta6ivisfg575k3ihl2n0/34965695181.pdfIn PDF document text
    • https://dineflon.com//files/waludafedarasawikaxali.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/niwebami.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69017e7318---12691070691.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/522397166.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4ed4f5badfd45bd0f5a11b2b30539d92/vivenunoxugevepomoxedeve.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/satenabelelekakadel.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/kekorovadebonulem.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b167361cff---21787225144.pdfIn PDF document text
    • https://shidoremicrosys.com/media/meturevubukibujamumurij.pdfIn PDF document text
    • https://luminex.pl/upload/file/3344316409.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca727daa7---64076619359.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/65df99f37250373bf7febe4d6f14a08c/silipawolibegovizodonuxiw.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/zoxubaxilat.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/35387a00b15e4ba3d4be3504c477cac1/juwilutox.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9d232c5d---wufivovo.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/49de40689c9eab2adef4cf38b3c4ed1d/98214190841.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
    • http://scripts.sil.org/OFLIn 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_off0000d9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CE 5512 bytes
SHA-256: ec1268b52431d8132e70ed5949d08028ccc4aa641cec631e3413349654c584fa
font_01_sfnt_off0000ec62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 11048 bytes
SHA-256: c045c25918db89cd3888cedcfeda862b8553f04c6108317b9ded848f9869d5dd
font_02_sfnt_off000111ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111ED 16152 bytes
SHA-256: 27dbea658a405d05c7bce15d0828c56848c17d661bcb89c8b15a4334cf5658cb

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