Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b9234fa9678973…

MALICIOUS

PDF

94.7 KB Created: 2021-08-19 21:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 378e1ecb31434c8ffd87ecb429a75f3e SHA-1: dab4373f16e1320803237f881c2b44fb9811c56a SHA-256: 95b9234fa96789737a5d4901f8a41d34f5675f6f3ffb1c214fea9baf38660bd7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised WordPress installations. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/b2cb9f6992ec391346fb496f1b9cf84c/52462761483.pdf In PDF document text
    • http://vtvxm.vn/userfiles/file/vogataramejevezo.pdfIn PDF document text
    • http://deasreunion.com/clients/860224/File/57031435906.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/vuzojumabik.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/nlicq4ttm3ph64ncnicc8i4r94/53323868006.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cabbe8c578---rumabu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e9bda1ed4.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/8fueonpr7dg1tppslc2kg8oqo5/dikubekazi.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/tivurukotozegaxurowut.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/89d650e39ed7c3cc3a36931d134a04e3/pagox.pdfIn PDF document text
    • http://szwygs.com/upload/63798947559.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54cb05030b---wupasonibepilavetifuku.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/81046827761.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/85347858548.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/ritikezedos.pdfIn PDF document text
    • http://camwater.org/media/files/dafirum.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/dadopufakinuzajuvi.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160785ca868a1c---kafunovokawuf.pdfIn PDF document text
    • https://epiphanych.com/images/file/20366736882.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/rodakubeseboxelanajizej.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1eede9ee5---pegatamebovobomaropuvusi.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/rafanuxurunil.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/zabuwajupapexatetojate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=3d+shapes+worksheets+2nd+gradePDF 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_off00010dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 16920 bytes
SHA-256: fb22e25f4be93af9e7f5fafa587a8aced2a8171196a1f2d0c6e6c25c627d073d
font_01_sfnt_off000139c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D8 10904 bytes
SHA-256: d5111a5d200d5ca65126417c0ddc33144045f76c3b104d9fec36ba659bd4cf6d