Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2a77f572034461…

MALICIOUS

PDF

90.5 KB Created: 2021-07-14 06:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60a43bc3b85c2849a4629a1888dae35d SHA-1: baefab665dac5188659bb1e02e727d29a2c67e0a SHA-256: ec2a77f57203446170d4870d135bbbc322a9a3f04acf0100b347a5cf43a6716f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URLs that likely lead to malicious content or further infection vectors. The PDF structure and embedded URLs suggest an attempt to lure users to compromised websites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=snape+and+marauders PDF link annotation
    • http://www.masozilina.sk/ckfinder/userfiles/files/83788537058.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/rezujowepevejineru.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/23332741403.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/27491299203.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac01982f300---navemowozafexuvojavanif.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aae6d2af2cf7be9c49fb37bd0c456133/62842888221.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/setiboxadopapugosorutoraz.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/46119856097.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/43080983325.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca011546a7a---77968263994.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbca2d83ad7---sorider.pdfIn PDF document text
    • https://laps.pl/userfiles/file/88233224437.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/betesa.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/51142384375.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/12435754122.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e7be680299baedc7c52de7f5ec7087ab/zajowilorifok.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/61833560577.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076c820592e5---nunukuboxo.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/sukofizasuzenejove.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/iooucavlv9c5jmhs2beg4oddl7/64211363747.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/30314968294.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/79655883129.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_off0000ff65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF65 17192 bytes
SHA-256: 4b1e23a6ae46852c7f72641b7658709e040e411def3f6d838cbff3c8feabbe3c
font_01_sfnt_off00012c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001445e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1445E 10372 bytes
SHA-256: 2ae1ab4fad88e027e470e51bd56feed81743e2b31c215966c78853136677ca41

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