Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea77f2827042f5bd…

MALICIOUS

PDF

78.6 KB Created: 2021-09-05 18:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e5d99a24bc6492f8c48851adaa23b377 SHA-1: b93c67f66eacf9ed4cfb6e7fef823556542a84df SHA-256: ea77f2827042f5bdd951ee0a5436e71d9dc1542a915540a71e7c5bfe2b6b4f1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing a trojan. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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=wbcs+2019+mains+question+paper+pdf+download PDF link annotation
    • http://thermogroup.ru/uploads/files/saxesaji.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/56039622952.pdfIn PDF document text
    • https://semut73.com/contents//files/27687359169.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/vozibawakarikikobo.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/83024441716.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991d4115ed1---62418580179.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717574a1f1a---dopej.pdfIn PDF document text
    • http://goref.ru/files/file/89077610306.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/85917808088.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608135d0a0761---woxotojanefi.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160be210ed3d7d---fanomejerukomojotinuzik.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/77296887855.pdfIn PDF document text
    • http://wisewood50th.com/clients/3/35/35ca2b70ae131fa39667c240906a3fe4/File/17751163934.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/41959135099.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160d22d45f1e2f---widexamiteroje.pdfIn PDF document text
    • http://aurora-c.jp/files/files/jirikuwevisujufeduxune.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ncm2iicvku0u4c3sdg8a6fu8au/fumutidufivexegoj.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/f2f0c9a7ef7c5981cc6b864033dab50a/84429683649.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/xudojukorapud.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106111131514966.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/80818779958.pdfIn 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://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_off0000c609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC609 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE20 11708 bytes
SHA-256: 2b7b3ae511e18fe00fb62b0724d40286cd25ef8b0ec69fa7f83125a246c8ad4c
font_02_sfnt_off0000f9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C9 19756 bytes
SHA-256: d8a372c7332ac67440c5b1e037c3f18b8e7ab156a60f3a21bef46a333264ba3e

Open this report in the interactive analyzer, or submit your own file for analysis.