Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1872e5430419cd…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 02:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8b74dfe9fddba8b435f3097246fb7a3 SHA-1: 8bee02cdecf77881de4082677990777567c001ed SHA-256: 5a1872e5430419cdc7f0b13c4b2f9f91cbbe406d9a1c0636016774669421ba24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to external websites, some of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics strongly suggest this file is used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=android+cast+video+to+chromecast PDF link annotation
    • https://sbsoftware.ro/admin/userfiles/file/zirojaxixi.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16141e6e00ec87---wejamawetasozadu.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/29088bc150a2bdd7193ce5c46715b27a/ronebesipanibu.pdfIn PDF document text
    • https://firstview.christoff-design.com/files/74623630857.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/sokemiba.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/rivikisefugaduvepa.pdfIn PDF document text
    • http://donghotam.com/luutru/files/rufojunevixifipudizapu.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/20653818464.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/6492644176.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/77052672883.pdfIn PDF document text
    • http://konberdbio.com/upload/files/tasofufarojigemizune.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/81976253104.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/31866295526.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/lojefumeforavub.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec01080e30---tibezutowolepe.pdfIn PDF document text
    • http://ttc-investco.com/img/files/rinefuvepasunuwizulu.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210910124247.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/rakefibibezafi.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/82754389028.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161329b8a0c38c---rivejo.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/panegewuganakepuj.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/zosibejetubejajeve.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/87078124571.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_off0000da89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA89 10636 bytes
SHA-256: b818713a3e8ed6d9518322ef1348c64398b510b9ca3c1ed1f968f086d27a8042
font_01_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 19008 bytes
SHA-256: 7fffc5cc3afada3805ef360f3e1d20d40cdad6a417acf0c52e058746cf8aafed
font_02_sfnt_off00012406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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