Malicious PDF — malware analysis report

Static analysis result for SHA-256 306ee68c24273700…

MALICIOUS

PDF

84.6 KB Created: 2021-07-14 03:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca3ae118e544d593b3e980dfe0468e30 SHA-1: 331a6a861567a302e165a0dcfe679cecb510ff8b SHA-256: 306ee68c24273700d4d03ba5620bdd8fb6fe4ccdaf3c0cccb38cb2d5de5f0200
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF viewers. It also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e24f42d5bc4---59752793185.pdf In PDF document text
    • https://ubranni.com/uploader/files/15282109785.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/bosilusupugadovo.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608149c86ac72---labepofeperolaz.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/totujakatigoreloxoruner.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/didujigijebofaso.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e5dad4cc1---bafevivulomirenarez.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/54a1f655a60eb849cfc174c02cb0553c/jufubufeju.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/xowikozavodubusuf.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/kixibani.pdfIn PDF document text
    • https://examonline.org/examonline/userfiles/file/78768522410.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/55838881134.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/kuvuwudufuxakiwafi.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/e76o83tuqufoddb1hbk5ccgfh1/71541990258.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/109740c277fac7bf9facb857bb332a16/wozasusafijogategusi.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/xinipixe.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/86d28d7c4aa8a2ca4ed52d4294f8576f/95922183582.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/kejifelemixududodeke.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/n0jl2k25qh3u8tobdpnvirudhe/fomidejufunejujudetoko.pdfIn PDF document text
    • http://yuha.be/_files/file/6734465863.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4413c6778---70343973375.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/mujesenixikizelilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=equity+in+forexPDF link annotation
    • 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_off0000e88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 17324 bytes
SHA-256: 5ccfad8a6b5148f41479ec3ea885d9e66c7148cb234301843c16a158e321a045
font_02_sfnt_off00012e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E24 10276 bytes
SHA-256: 31756121e90281a64fc59ccb5dd55bc68ecfd05150dc37d5ef67ca5ede0418c8

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