Malicious PDF — malware analysis report

Static analysis result for SHA-256 07ab7323a6a2fbc5…

MALICIOUS

PDF

72.3 KB Created: 2021-09-08 02:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f566270dba93a2d7cdb7e3c87bca6e2 SHA-1: d205d873a3e7af46a7e0d83e43b75f45749a8a56 SHA-256: 07ab7323a6a2fbc59b361c61f4588c4224114bbdd1890f3d02aea813af0f4a24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab81ee0620e---kuvarepojasifijetude.pdf In PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9617e8d38a3b2c5dbd029a1c44731113/38979037478.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/6co6li97dfcf9i7emosgm3ve8o/81696298895.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/87926135610.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/efe45686d7e33e55874fa3b25699ec9d/7588509103.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/37191226683.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fcb569342---25548318027.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbffae1a35---dudexepezizolirat.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/laxovanumi.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/89986880329.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/fifunuwijor.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/jivubabi.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/54117242662.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/cp2heti7q9q41ef3d3qgq0kfoq/19361106506.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd40ea5cfa---bilalasuzegijasajanuk.pdfIn PDF document text
    • http://jarosi.hu/files/file/58847464586.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee8230af50---1839784476.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/56166188239.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/sorapiwezadorogolanazi.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090b578c8706---60445064619.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/86644071565.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/29/file/20210529_155311_138.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/rorevefisodavul.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d86ef403d4---8562216906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=moonlight+sonata+sheet+music+pdfPDF 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_off0000b944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB944 16284 bytes
SHA-256: 9d53b993e0340b6b63ae61cf95cc4dbbb4afc8649f0fc5134e61e6e1ecb129d5
font_01_sfnt_off0000e251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA68 11060 bytes
SHA-256: a06332ac3e7d9d1f3c640f7a2038d8bee14cd3de272d592a758e47ce090ca19f