Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9e192bf90643d2…

MALICIOUS

PDF

90.1 KB Created: 2021-07-06 04:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7db6ba5c935e891f70b3572038cdcf1b SHA-1: 42c2904376fa1f94eaea1e16b426abf7a7e6a11e SHA-256: ef9e192bf90643d2cba589d83d57c386f88ef2af5229e969585af1c1bfa5912c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, 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 malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://pistant.ru/uplcv?utm_term=temporary+cessation+of+breathing PDF link annotation
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/631b56eb2475d97b256bb33e9289b104/xolak.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/30428606599.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/opmdrsi5l0b0scfb002dsj9tqo/84294639817.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/beganededopavex.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160839e153d47d---71863247485.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/23638208470.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6db70553---dipemowarureri.pdfIn PDF document text
    • https://actor-conseil.com/files/file/44620539349.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b79a0cb9383---11978226297.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/050445322331.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021051321443935.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/liromifefexuju.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709c6ae285f---45318479848.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/nizopimam.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/95285923786.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/a161f4c23708bd11790888e270419874/43259750802.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/83810791363.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/kemagav.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098b0e83b8b8---vuravogudum.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/ripajikorudabumafa.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/kilixamikejofonomejivodi.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/99799488827.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe87e70be8---wizax.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609264f152719---rurafivozetazamogo.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ec90d5fee---54105139124.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/nuxilexulelikejej.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_off0000fc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001141b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141B 11096 bytes
SHA-256: 72c6498ea60e642b5a106d3fb00f293eb68bae8f2073ceaf80857f790df01c8b
font_02_sfnt_off00012d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9E 17192 bytes
SHA-256: fdeee6cea7bffefefb135de8c5bbce7a6269d9a9bfdc85ec13a71aef51143d92

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