Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe27a0894aec126…

MALICIOUS

PDF

110.3 KB Created: 2021-08-15 04:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: d8255e64eb0af6aaaad3dee4b45580e9 SHA-1: ad17d0780aa10be88b889e33ba76f2da5b287253 SHA-256: 6fe27a0894aec12644796df2da315d2ca31fed6954e3c02feb8401198631b57c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://akgikorea.com/file_upload/fck_upfile/file/40657809487.pdf In PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/vavobaturipavamuxonuwego.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16073ddabe014a---ketikamozuxakubub.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/88e4c4fcca30e14514df951c1d6af2d8/19230901569.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e48849050---jipag.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a740b8947c---lekerewivotigokosudos.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/6h26fn9b0773s7oprgge1f96u4/turovudilipoka.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/f5fa7a33c8afe3fae4e05cdac3d54625/41458201921.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/95379054470.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/18911681950.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/zibibona.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/6ga5bvsv4vvhgu0vj6ucl0u982/5361732681.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/98694094181.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/peboza.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/8917072ddf4b03bf487c31b99d52d672/87654347090.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100c7ea93e7e---82463020870.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/vawapudabupala.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/selibev.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/16962665977.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081ce49d2068---27526960517.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/wasag.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/21222959304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=headway+intermediate+fourth+edition+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00012345.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12345 18224 bytes
SHA-256: 01e2cc413cd42e86904264e60b29bb647062e7f929aa68fc7dfc2ef2ab9aeeb0
font_01_sfnt_off00013fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15803 10884 bytes
SHA-256: f2eadce214f6e4145ca4685c4e7ee4595506a4202ed01288eb90e6a294aadae5
font_03_sfnt_off000170ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170ED 22096 bytes
SHA-256: ec8fd006cb792a9dcfda2f74c8c5a10011847631520eec9d0302a7eb12141abd

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