Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee2182631a0dbe4…

MALICIOUS

PDF

80.9 KB Created: 2021-09-11 12:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d35e132f8eaea825d397415816418d43 SHA-1: ceb5cdf86e9143d7dae6decc2cb2966320ef6b6b SHA-256: cee2182631a0dbe403884fa6fac3ac23b3a775be9ea668204eee8ef9e0020576
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=the+book+of+enoch+pdf+free+download PDF link annotation
    • https://topupdana.com/contents/files/68668542262.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/12721711081.pdfIn PDF document text
    • http://lulanjina.net/upload/files/neruxow.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///xudumimobi.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/97732882979.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130db9ebefbf---zogeziviw.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///pofikaruputirokobilep.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/3faf6f3cb9edc012d5e3bd503a7c512f/sivexaraxut.pdfIn PDF document text
    • http://rayer.cn/d/files/nabomapelumarawodu.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/rubureninorexina.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/zusowanujogasidu.pdfIn PDF document text
    • http://laserinnsbruck.com/static/gugafixuk.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/h1f8t97c26n1jqfa4a60u5kdia/91873677108.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/2663739981.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/79709714805.pdfIn PDF document text
    • http://elskenecologie.nl/files/pugevuzenipijalelemepuge.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/fovirinawa.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/ratupomapozagowixunuseno.pdfIn PDF document text
    • https://simorgh.it/uploads/file/44374053490.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/mowelusufifexiluvuradepi.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1d6366f30---39656433164.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/vebigogosobuzo.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_off0000d618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD618 18600 bytes
SHA-256: 5359b21558c0db9670e147ad686f8ee103e3d5fa49714d483004f4e24757c223
font_01_sfnt_off0001063c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E53 10640 bytes
SHA-256: f05124464a1f61455a459bad75ebff47b78b37e1b4108b03f3663ee290e29a2f