Malicious PDF — malware analysis report

Static analysis result for SHA-256 f479b9c60f239908…

MALICIOUS

PDF

87.6 KB Created: 2021-07-25 18:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c61fb3a03797e16e03dc0303a1b79e8e SHA-1: 7938b93d7262b1a08822341c5e36d70e003813fc SHA-256: f479b9c60f239908467dd839147e888bf927bc5f774bb990ed5dbc6e54b65214
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Installation

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting an attempt to redirect users to malicious content. The heuristic 'SE_SECURITY_BYPASS' indicates the document may instruct users to disable security software, a common tactic in phishing and malware delivery to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcd0ae580f---zeruxo.pdf In PDF document text
    • https://marosme.ro/hirek/file/35671402026.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/74373800738.pdfIn PDF document text
    • http://health-bridge.in/upload/file/18854122171.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/kuxezo.pdfIn PDF document text
    • https://puppometalli.eu/file/surowumuraro.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e72b0e462---57396318717.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/t7vdveq9u7dr96mlrceg32uljm/78554419727.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f008246f242---86322580357.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/41164539360.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/1f8fkgvp9umis5db7gaah2p3od/vufuluwetotomonuvufut.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea36f79d39---85111450613.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c31d2e44d14---53171115666.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9028b2d34---mojawutepurujuja.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/f4c61fd184123520cb6ecfe66f302597/pogisalafe.pdfIn PDF document text
    • https://aashianarealty.com/file/fates.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/86766161734.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/0ebe0c5ed1cd64edee2d5ead4906ccdf/dipidiroloxobariful.pdfIn PDF document text
    • https://morabia.fi/images/file/44808237885.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/49480806887.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/emefrofp1j5rpf32psdcq366e3/28778939701.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c26595ee4e1---4938863100.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/bovikipanezugo.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/6f9390ae8c28e499b1071d522fff77ff/95856139359.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921e86dc2e8---68740403793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=why+are+all+the+lights+on+my+modem+blinkingPDF 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_off0000f22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 16960 bytes
SHA-256: 8434da558d8f7d5f5f3b914ee09bcd8246f9fe9d85bca3e1aafd431eb552641d
font_02_sfnt_off00013661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13661 11032 bytes
SHA-256: 31e29f81c9e25b812da615f0e094bf9357b7742771783709ccc2452481f643ce

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