Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3bce3bc66402ec…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 00:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e731f9f10ec89cff04b286819e6dcc44 SHA-1: 98fdd48da2a3b8a0ec5c098f3d8f6046421db742 SHA-256: cd3bce3bc66402ec0b0fb2c127ddec84b7372e1eeb0906f53692fc705a323212
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm. The PDF's structure and the presence of external URIs suggest it is designed to redirect users to potentially malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://armenia4d.com/contents//files/mimas.pdf In PDF document text
    • http://kaies.cn/upfiles/file/73077362620.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/98470333261.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210512044820.pdfIn PDF document text
    • http://atrsara.ir/resource/files/84891730133.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/tisinebenutibipanexone.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/7e97hbqvac5c56ui72d1eo74nq/tizenujogizugodafirileloj.pdfIn PDF document text
    • http://tulsamemorialclass1969.com/clients/8/8b/8b8b36ecbaf17f244e47af75a29dfbe2/File/joroguferaxulatora.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/5rlppmeaavqc1jlhgaoqnsuih1/37156881817.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/c0500931d7baa1b9f08a9fb6cc0a3764/bugodidavipiguve.pdfIn PDF document text
    • http://nessium.net/userfiles/file/83170549192.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160873e53022ca---7431466222.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/1fce9e321ef0a779590d744b740c6105/50157747201.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/965ced87326d317398985b26e71147d5/nitesujexogunowibusojob.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/siwotigotupida.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/rekevodinidubedif.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/f3d69398880cc85c9e18691b7e8303a9/74122068743.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac76751d42d---fuxojuwiromaz.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/94594359836.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/22942700107.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/0c2b4a0445e9b467e685236cbafd9d17/fuwijefisub.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/516a744bd6b9f345790bcb51c2597272/perini.pdfIn PDF document text
    • http://skupka54.ru/upload/m/jogudifofapodekula.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/49605426660.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/kefexupefakagobozukasir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=front+right+side+of+the+brainPDF 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_off0000dd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD27 10704 bytes
SHA-256: 2ec87f4ffb7229d48f27634e1173f4a43647a9794e855cda4afa7bd4c2d05cdd
font_01_sfnt_off0000f562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF562 16532 bytes
SHA-256: 0189c84a8993dc4147bda4570220d6f00139ff2a6c2ecd0cbd28e6b25da08105
font_02_sfnt_off00011fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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