Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d9e2a24b3291ce…

MALICIOUS

PDF

70.9 KB Created: 2021-09-03 22:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bbabc1b816e6348fa323602c4ba6c804 SHA-1: 903f61a9c09bd4573f4836773812751c93bfa26a SHA-256: 78d9e2a24b3291ceca852c1381e2b60b4dd6f1549e1827f67d8b59ca6b178e8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. This pattern suggests an attempt to distribute malware or conduct phishing by leveraging these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/76bd50142242d2bb01db8d59f32d3fd5/41310358073.pdf In PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/9da7b46f3afb577e33bae15cf080cfe2/64981682455.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/b18caf82db0ea0058d9a4b91cc026832/rujevaxidezezi.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/sepibusoxekusutepivip.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/wufiruwipikalawepujogi.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c27ce2233---63798726281.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/jegekiwofusuwudin.pdfIn PDF document text
    • https://btegypt.com/file/nutixalujibenafubapetot.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f5bbb52d9996c66f75f210708cefa0b/29615596764.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/rigirorexotanud.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23329817ac---loximezulabilus.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096849be1ac4---laxiva.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/61567287953.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/3298693908.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f05bc48b26b---penoxubove.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b2e1eaf62---nivobuj.pdfIn PDF document text
    • https://cargobull.cz/res/file/berugitefixenezegozija.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/winoranaw.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e5164cb6205---kivipobalaguvumavasokeba.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/rebujewotemalejixilijodu.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/9mt9gbetsjtoi6k0usclhlicnu/mapetoki.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4def3e68f---leporobuniwaku.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202108240406506873.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/kgvotul4c61bibhg198e9stsf5/91412948484.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/veo84bc09gi5tg6t6r9popnhkv/60229633945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=kindergarten+printable+worksheets+lettersPDF 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_off0000b7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D7 10980 bytes
SHA-256: 508010ee7155268ae5ec59cedfa410504f94769c41ec9ec434bdc5b6e7394650
font_01_sfnt_off0000d0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D6 14968 bytes
SHA-256: 22e308de99325888a45f0270ae0b0278a6e6ab7f98d7182f0c95220433ffd211
font_02_sfnt_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1